A113372 Column 2 of triangle A113370, also equals column 0 of A113370^7.

1, 7, 91, 1722, 43764, 1415799, 56096733, 2644883675, 145131435225, 9107198292451, 644373208531066, 50814103000624929, 4423148359685316443, 421540670702940409866, 43680252604560889074884

Offset: 0

Author

Paul D. Hanna, Nov 13 2005

Keywords

• nonn

Comments

Column k of A113370 = column 0 of A113370^(3*k+1) for k>=0.

Crossrefs

Cf. A113370, A113371 (column 1), A113373 (column 3).

Programs

PARI

a(n)=local(A,B);A=Mat(1);for(m=2,n+3,B=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,B[i,j]=1,if(j==1, B[i,1]=1,B[i,j]=(A^(3*j-2))[i-j+1,1]));));A=B);A[n+3,3]