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A117398
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Matrix log of triangle A117396.
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3
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0, 1, 0, 0, 2, 0, -1, 2, 3, 0, -3, 4, 5, 4, 0, -9, 14, 15, 9, 5, 0, -33, 68, 65, 34, 14, 6, 0, -153, 404, 359, 174, 63, 20, 7, 0, -873, 2804, 2375, 1098, 371, 104, 27, 8, 0, -5913, 22244, 18215, 8154, 2639, 692, 159, 35, 9, 0, -46233, 198644, 158615, 69354, 21791, 5480, 1179, 230, 44, 10, 0
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OFFSET
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0,5
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COMMENTS
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Column 0 contains negative of sequence A007489.
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LINKS
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FORMULA
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T(n, n) = 0.
T(n, 0) = n*[n<2] - A007489(n-2)*[n>1].
T(n, 1) = 0 + 2*A117399(n-1)*[n>1].
Sum_{k=0..n} T(n, k) = A003422(n). (End)
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EXAMPLE
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Triangle begins:
0;
1, 0;
0, 2, 0;
-1, 2, 3, 0;
-3, 4, 5, 4, 0;
-9, 14, 15, 9, 5, 0;
-33, 68, 65, 34, 14, 6, 0;
-153, 404, 359, 174, 63, 20, 7, 0;
-873, 2804, 2375, 1098, 371, 104, 27, 8, 0;
-5913, 22244, 18215, 8154, 2639, 692, 159, 35, 9, 0;
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MATHEMATICA
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m=12;
M= Table[If[k>n-1, 0, If[k==n-1, n, -1]], {n, 0, m+1}, {k, 0, m+1}];
T:= T= Sum[MatrixPower[M, j]/j, {j, m+1}];
Table[T[[n+1, k+1]], {n, 0, m}, {k, 0, n}]//Flatten (* G. C. Greubel, Sep 06 2022 *)
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PROG
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(PARI) {T(n, k)=local(M=matrix(n+4, n+4, r, c, if(r>=c, if(r==c+1, -c, 1))), L=sum(m=1, n+4, (M^0-M)^m/m)); L[n+1, k+1]}
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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