A102923 - OEIS

A102923

Row sums of triangle A102920, which equals the matrix square of A102098.

1, 7, 85, 2369, 127796, 11417607, 1536493698, 292107021267, 74862835208823, 24954353268384100, 10517125257007205287, 5477412008465124456814, 3459179319447147792978276, 2607366906177104506271124036

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OFFSET

0,2

COMMENTS

Triangle A102098 shifts each column up 1 row under matrix cube.

LINKS

Table of n, a(n) for n=0..13.

PROG

(PARI) {a(n)=local(A=matrix(2, 2), 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(sum(k=0, n, (A^2)[n+1, k+1]))}

CROSSREFS

Cf. A102920, A102098.

Sequence in context: A368787 A207214 A000686 * A220246 A196257 A296382

Adjacent sequences: A102920 A102921 A102922 * A102924 A102925 A102926

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 21 2005

STATUS

approved