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A102922 Column 1 of triangle A102920, which equals the matrix square of A102098. 2
0, 4, 40, 1128, 61120, 5466320, 735847800, 139910204080, 35858685086352, 11953187179149408, 5037776918810353960, 2623732639426967662648, 1656984556235159516822400, 1248959074762601252295551168 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Equals the odd bisection of A102917. 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, if(j==1, B[i, j]=(A^3)[i-1, 1], B[i, j]=(A^3)[i-1, j])); )); A=B); return((A^2)[n+1, 2])}

CROSSREFS

Cf. A102920, A102098, A102917.

Sequence in context: A013108 A173945 A111846 * A139688 A197356 A292416

Adjacent sequences:  A102919 A102920 A102921 * A102923 A102924 A102925

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 21 2005

STATUS

approved

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Last modified March 26 14:18 EDT 2019. Contains 321497 sequences. (Running on oeis4.)