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A054654
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Triangle read by rows: matrix product of the binomial coefficients with the Stirling numbers of the first kind.
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10
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1, 1, 0, 1, -1, 0, 1, -3, 2, 0, 1, -6, 11, -6, 0, 1, -10, 35, -50, 24, 0, 1, -15, 85, -225, 274, -120, 0, 1, -21, 175, -735, 1624, -1764, 720, 0, 1, -28, 322, -1960, 6769, -13132, 13068, -5040, 0
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history;
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OFFSET
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0,8
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COMMENTS
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The sum of the entries on each row of the triangle, starting on the 3rd row, equals 0. E.g. 1+(-3)+2+0 = 0
The entries on the triangle can be computed as follows. T(n,r) = T(n-1,r) - (n-1)*T(n-1,r-1). T(n,r) = 0 when r equals 0 or r > n. T(n,r) = 1 if n==1
Triangle T(n,k) giving coefficients in expansion of n!*C(x,n) in powers of x. E.g. 3!*C(x,3) = x^3-3*x^2+2*x.
The matrix product of binomial coefficients with the Stirling numbers of the first kind results in the Stirling numbers of the first kind again, but the triangle is shifted by (1,1).
Essentially [1,0,1,0,1,0,1,0,...] DELTA [0,-1,-1,-2,-2,-3,-3,-4,-4,...] where DELTA is the operator defined in A084938 ; mirror image of the Stirling-1 triangle A048994 . - Philippe DELEHAM, Dec 30 2006
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LINKS
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Table of n, a(n) for n=0..44.
Eric Weisstein's World of Mathematics, Pochhammer Symbol
Eric Weisstein's World of Mathematics, Rising Factorial
Eric Weisstein's World of Mathematics, FallingFactorial
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FORMULA
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n!*binomial(x, n) = Sum T(n, k)*x^(n-k), k=0..n.
(In Maple notation:) Matrix product A*B of matrix A[i,j]:=binomial(j-1,i-1) with i = 1 to p+1, j = 1 to p+1, p=8 and of matrix B[i,j]:=stirling1(j,i) with i from 1 to d, j from 1 to d, d=9.
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EXAMPLE
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Matrix begins:
1 0 0 0 0 0 0 0 0
0 1 -1 2 -6 24 -120 720 -5040
0 0 1 -3 11 -50 274 -1764 13068
0 0 0 1 -6 35 -225 1624 -13132
0 0 0 0 1 -10 85 -735 6769
0 0 0 0 0 1 -15 175 -1960
0 0 0 0 0 0 1 -21 322
0 0 0 0 0 0 0 1 -28
0 0 0 0 0 0 0 0 1
...
Triangle begins:
1;
1, 0;
1, -1, 0;
1, -3, 2, 0;
1, -6, 11, -6, 0;
1, -10, 35, -50, 24, 0;
1, -15, 85, -225, 274, -120, 0;
1, -21, 175, -735, 1624, -1764, 720, 0;
...
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MAPLE
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a054654_row := proc(n) local k; seq(coeff(expand((-1)^n*pochhammer (-x, n)), x, n-k), k=0..n) end:
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MATHEMATICA
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row[n_] := Reverse[ CoefficientList[ (-1)^n*Pochhammer[-x, n], x] ]; Flatten[ Table[ row[n], {n, 0, 8}]] (* From Jean-François Alcover, Feb 16 2012, after Maple *)
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PROG
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(PARI) T(n, k)=polcoeff(n!*binomial(x, n), n-k)
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CROSSREFS
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Essentially Stirling numbers of first kind, multiplied by factorials - see A008276. Cf. A054655.
Cf. A039810, A039814, A126350, A126351, A126353.
Sequence in context: A008783 A139144 A081576 * A154477 A142071 A193283
Adjacent sequences: A054651 A054652 A054653 * A054655 A054656 A054657
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KEYWORD
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tabl,sign,easy,nice
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AUTHOR
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N. J. A. Sloane, Apr 18 2000
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EXTENSIONS
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Additional comments from Thomas Wieder, Dec 29 2006
Edited by N. J. A. Sloane at the suggestion of Eric Weisstein, Jan 20 2008
Added a comment concerning the sum of the entries on a row which is always 0 for all row >= 3 and the formula T(n,r)=T(n-1,r) - (n-1)*T(n-1,r-1) Doudou Kisabaka (dougk7(AT)gmail.com), Dec 18 2009
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STATUS
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approved
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