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 A111539 #3 Mar 30 2012 18:36:50
%S A111539 1,2,7,34,211,1564,13291,126430,1326211,15184744,188348659,2515991290,
%T A111539 36018842875,550317892372,8940695112331,153950966471734,
%U A111539 2801321782936819,53720913548093344,1083061044893428675
%N A111539 Row sums of triangle A111536.
%o A111539 (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+1)!/1!*x^i)),m-j-1))))^-1)[n+1,k]))}
%Y A111539 Cf. A111536.
%K A111539 nonn
%O A111539 0,2
%A A111539 _Paul D. Hanna_, Aug 06 2005