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 A187118 #6 Mar 30 2012 18:37:26
%S A187118 1,3,12,67,512,5143,64988,995334,17948683,372703529,8759307844,
%T A187118 229843336284,6660078541359,211201170221925,7274712426981184,
%U A187118 270441300892307916,10791919593795653296,460087687818627367809
%N A187118 Rows sums of triangle A187115.
%C A187118 Definition of triangle: A187115(n,k) = [y^k] R_{n-1}(y+y^2) for k=2..n, n>2, where R_n(y) is the n-th row polynomial starting with R_2(y)=y^2.
%o A187118 (PARI) {a(n)=local(Rn=y^2);for(m=2,n,Rn=subst(truncate(Rn),y,y+y^2+O(y^m)));subst(truncate(Rn),y,1)}
%Y A187118 Cf. A187115, A135082, A187116, A187117, A187008.
%K A187118 nonn
%O A187118 2,2
%A A187118 _Paul D. Hanna_, Mar 08 2011