A113091 Column 1 of triangle A113090.

1, 12, 255, 11326, 1136709, 272246616, 162043308555, 246976754748242, 985451332639242321, 10465989453804481920460, 299684548041297413533699479, 23373481327888949572209959486022, 5007060652963472122780384849366677469

Offset: 1

Author

Paul D. Hanna, Oct 14 2005

Keywords

• nonn

Crossrefs

Cf. A113090.

Programs

PARI

{a(n)=local(M=matrix(n+1,n+1));for(r=1,n+1, for(c=1,r, M[r,c]=if(r==c,1,if(c>1,(M^3)[r-1,c-1])+(M^3)[r-1,c]))); return(if(n<1,0,(M^3)[n+1,2]))}