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 A111545 #3 Mar 30 2012 18:36:50
%S A111545 1,2,9,57,441,3933,39249,430677,5137641,66103533,911973249,
%T A111545 13428837477,210259505241,3489291147933,61200522593649,
%U A111545 1131630622515477,22007781151434441,449197758198576333,9603342828706622049
%N A111545 Column 1 of triangle A111544.
%o A111545 (PARI) {a(n)=if(n<0,0,(matrix(n+2,n+2,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+2,2])}
%Y A111545 Cf. A111544.
%K A111545 nonn
%O A111545 0,2
%A A111545 _Paul D. Hanna_, Aug 07 2005