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
Keywords
Crossrefs
Cf. A106208.
Programs
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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)))}