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Search: id:A102920
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| A102920 |
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Triangular matrix, read by rows, equal to the matrix square of A102098. |
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+0
7
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| 1, 3, 4, 36, 40, 9, 1036, 1128, 189, 16, 56355, 61120, 9720, 576, 25, 5045370, 5466320, 857466, 47040, 1375, 36, 679409158, 735847800, 114915375, 6155008, 163500, 2808, 49, 129195427716, 139910204080, 21813099606, 1158059520, 29767000, 458136
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Column 0 is A102921. Column 1 is A102922.
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EXAMPLE
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Rows begin:
[1],
[3,4],
[36,40,9],
[1036,1128,189,16],
[56355,61120,9720,576,25],
[5045370,5466320,857466,47040,1375,36],
[679409158,735847800,114915375,6155008,163500,2808,49],...
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PROGRAM
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(PARI) {T(n, k)=local(A=matrix(1, 1), B); A[1, 1]=1; for (m=2, n+1, B=matrix(m, m); for (i=1, m, for (j=1, i, if(j==i, B[i, j]=j, B[i, j]=(A^3)[i-1, j]); )); A=B); return((A^2)[n+1, k+1])}
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CROSSREFS
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Cf. A102098, A102921, A102922, A102916.
Sequence in context: A066090 A042891 A032835 this_sequence A064335 A013330 A088168
Adjacent sequences: A102917 A102918 A102919 this_sequence A102921 A102922 A102923
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KEYWORD
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nonn,tabl
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jan 21 2005
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