A102922 Column 1 of triangle A102920, which equals the matrix square of A102098.

0, 4, 40, 1128, 61120, 5466320, 735847800, 139910204080, 35858685086352, 11953187179149408, 5037776918810353960, 2623732639426967662648, 1656984556235159516822400, 1248959074762601252295551168

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: A111846 A290000 A363423 * A139688 A197356 A292416

Adjacent sequences: A102919 A102920 A102921 * A102923 A102924 A102925

Keyword

nonn

Author

Paul D. Hanna, Jan 21 2005

Status

approved