A106209 Row sums of triangle A106208.

1, 2, 6, 30, 231, 2453, 33393, 556999, 11039026, 254128870, 6677972615, 197547561340, 6504619941881, 236165840696980, 9380353293627619, 404848232250564042, 18875601922237847288, 945875935431064488637

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Prog

(PARI) {a(n)=local(A=matrix(1, 1), B); A[1, 1]=1; for(m=2, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=j, if(j==1, B[i, j]=(A^2)[i-1, 1], B[i, j]=(A^2)[i-1, j])); )); A=B); return(sum(k=0, n, A[n+1, k+1]/(k+1)))}

Crossrefs

Cf. A106208.

Sequence in context: A089459 A027882 A306782 * A003266 A303169 A369198

Adjacent sequences: A106206 A106207 A106208 * A106210 A106211 A106212

Keyword

nonn

Author

Paul D. Hanna, May 01 2005

Status

approved