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 A111552 #3 Mar 30 2012 18:36:50
%S A111552 1,2,8,46,338,2930,28726,311342,3679778,47000002,644538614,9443216366,
%T A111552 147222001954,2434125748082,42555399987686,784634319490894,
%U A111552 15221022251713538,309977607819594818,6613678784212854646
%N A111552 Row sums of triangle A111544.
%o A111552 (PARI) {a(n)=if(n<0,0,sum(k=1,n+1,(matrix(n+k,n+k,m,j,if(m==j,1,if(m==j+1,-m+1, -(m-j-1)*polcoeff(log(sum(i=0,m,(i+2)!/2!*x^i)),m-j-1))))^-1)[n+1,k]))}
%Y A111552 Cf. A111544.
%K A111552 nonn
%O A111552 0,2
%A A111552 _Paul D. Hanna_, Aug 07 2005