This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A112912 #3 Mar 30 2012 18:36:51
%S A112912 1,2,8,44,298,2358,21154,211100,2313030,27566654,354806116,4903884712,
%T A112912 72444584732,1139381007880,19012236634968,335560664081388,
%U A112912 6247230709277958,122375974186267566,2516528486416495240
%N A112912 Column 1 of triangle A112911.
%F A112912 a(n) = Sum_{k=0..n-1} (n-k+1)*A088716(k)*a(n-k-1) for n>0 with a(0)=1.
%o A112912 (PARI) {a(n)=local(A=Mat(1),B);for(m=2,n+2,B=matrix(m,m);for(i=1,m, for(j=1,i, if(j==i,B[i,j]=1,B[i,j]=-j*(A^-1)[i-j,1]);));A=B);return((A^-1)[n+2,2])}
%Y A112912 Cf. A088716, A112911.
%K A112912 nonn
%O A112912 0,2
%A A112912 _Paul D. Hanna_, Oct 06 2005