A113352 Column 2 of triangle A113350, also equals column 0 of A113340^6.

1, 6, 51, 561, 7726, 129406, 2572892, 59525136, 1576414408, 47144606666, 1574176301192, 58126182666796, 2354183194432226, 103850488571214174, 4959424774062415780, 255032863135423053615, 14056171975717324065788

Offset: 0

Author

Paul D. Hanna, Nov 08 2005

Keywords

• nonn

Crossrefs

Cf. A113340, A113350, A113346 (column 0), A113351 (column 1), A113353 (column 3), A113354 (column 4).

Programs

PARI

a(n)=local(A,B);A=matrix(1,1);A[1,1]=1;for(m=2,n+1,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^6)[n+1,1]