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 A059332 Determinant of n X n matrix A defined by A[i,j] = (i+j-1)! for 1 <= i,j <= n. 8
 1, 2, 24, 3456, 9953280, 859963392000, 3120635156889600000, 634153008009974906880000000, 9278496603801318870491332608000000000, 12218100099725239100847669366019325952000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Hankel transform of n! (A000142(n)) and of A003319. - Paul Barry, Oct 07 2008 Hankel transform of A000255. - Paul Barry, Apr 22 2009 Monotonic magmas of size n, i.e., magmas with elements labeled 1..n where product(i,j) >= max(i,j). - Chad Brewbaker, Nov 03 2013 REFERENCES Paul Barry, Jacobsthal Decompositions of Pascal's Triangle, Ternary Trees, and Alternating Sign Matrices, Journal of Integer Sequences, 19, 2016, #16.3.5. LINKS FORMULA a(n) = a(n-1)*(n!)*(n-1)! for n >= 2 so a(n) = product k=1, 2, ..., n k!*(k-1)!. a(n) = 2^C(n,2)*product{k=1..(n-1), C(k+2,2)^(n-1-k)}. - Paul Barry, Jan 15 2009 a(n) = n!*product(k!, k=0..n-1)^2. - Johannes W. Meijer, Jun 27 2009 a(n) ~ (2*Pi)^(n+1/2) * exp(1/6 - n - 3*n^2/2) * n^(n^2 + n + 1/3) / A^2, where A = A074962 is the Glaisher-Kinkelin constant. - Vaclav Kotesovec, Aug 01 2015 EXAMPLE a(4) = 3456 because the relevant matrix is {1 2 6 24 / 2 6 24 120 / 6 24 120 720 / 24 120 720 5040 } and the determinant is 3456. MAPLE with(linalg): Digits := 500: A059332 := proc(n) local A, i, j: A := array(1..n, 1..n): for i from 1 to n do for j from 1 to n do A[i, j] := (i+j-1)! od: od: RETURN(det(A)) end: for n from 1 to 20 do printf(`%d, `, A059332(n)) od; MATHEMATICA Table[n! BarnesG[n+1]^2, {n, 1, 10}] (* Jean-François Alcover, Sep 19 2016 *) PROG (Ruby) def mono_choices(a, b, n)     n - [a, b].max end def all_mono_choices(n)     accum =1     0.upto(n-1) do |i|         0.upto(n-1) do |j|             accum = accum * mono_choices(i, j, n)         end     end     accum end 1.upto(12) do |k| puts all_mono_choices(k) end # Chad Brewbaker, Nov 03 2013 (PARI) A059332(n)=matdet(matrix(n, n, i, j, (i+j-1)!)) \\ - M. F. Hasler, Nov 03 2013 (PARI) a(n) = 2^binomial(n, 2)*prod(k=1, n-1, binomial(k+2, 2)^(n-1-k)) \\ Ralf Stephan, Nov 04 2013 CROSSREFS Cf. A010790. Cf. A162014 and A055209. - Johannes W. Meijer, Jun 27 2009 Sequence in context: A111428 A111429 A111430 * A000794 A159907 A242484 Adjacent sequences:  A059329 A059330 A059331 * A059333 A059334 A059335 KEYWORD nonn AUTHOR Noam Katz (noamkj(AT)hotmail.com), Jan 26 2001 EXTENSIONS More terms from James A. Sellers, Jan 29 2001 Offset corrected. Comment and formula aligned with new offset by Johannes W. Meijer, Jun 24 2009 STATUS approved

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Last modified October 23 12:59 EDT 2018. Contains 316528 sequences. (Running on oeis4.)