A102920 - OEIS

A102920

Triangular matrix, read by rows, equal to the matrix square of A102098.

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

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OFFSET

0,2

COMMENTS

Column 0 is A102921. Column 1 is A102922.

LINKS

Table of n, a(n) for n=0..33.

EXAMPLE

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],...

PROG

(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])}

CROSSREFS

Cf. A102098, A102921, A102922, A102916.

Sequence in context: A251259 A042891 A032835 * A064335 A376966 A013330

Adjacent sequences: A102917 A102918 A102919 * A102921 A102922 A102923

KEYWORD

nonn,tabl

AUTHOR

Paul D. Hanna, Jan 21 2005

STATUS

approved