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

Author

Paul D. Hanna, Jan 21 2005

Keywords

• nonn

Comments

Equals the odd bisection of A102917. Triangle A102098 shifts each column up 1 row under matrix cube.

Crossrefs

Cf. A102920, A102098, A102917.

Programs

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])}