A113343 Column 3 of triangle A113340, also equals column 0 of A113340^7.

1, 7, 70, 889, 13853, 258146, 5633264, 141487178, 4031806898, 128792484219, 4565493788191, 178051324792642, 7583098790779316, 350435514388561567, 17474323210108996497, 935597107908721785211, 53553176933223851350863

Offset: 0

Author

Paul D. Hanna, Nov 08 2005

Keywords

• nonn

Crossrefs

Cf. A113341 (column 1), A113342 (column 2), A113344 (column 4), A113340.

Programs

PARI

a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+4,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^(2*j-1))[i-j+1,1]));));A=B);A[n+4,4]