A098540 Row sums of triangle A098539, which shifts left one column under the matrix square.

1, 2, 5, 17, 81, 561, 5905, 98673, 2715025, 126550129, 10211715985, 1450856148081, 367849450783633, 168250359224212593, 140078954639877776273, 213886080203739816320113, 602782564524824650717471633

Offset: 0

Author

Paul D. Hanna, Sep 13 2004

Keywords

• nonn

Crossrefs

Cf. A098539, A098541.

Programs

PARI

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