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 A124463 #3 Mar 30 2012 18:37:01
%S A124463 1,4,13,44,162,637,2622,11188,49293,223768,1044661,5006126,24580704,
%T A124463 123464593,633467893,3315948760,17690431736,96101620364,531196784996,
%U A124463 2985589206506,17053375055317,98942675518256,582858713958087
%N A124463 Row 3 of rectangular table A124460.
%F A124463 G.f.: A(x) = Sum_{n>=0} x^n*R_n(x)^3, where R_n(x) is the g.f. of row n in table A124460 and satisfies: R_n(x) = Sum_{k>=0} x^k * R_k(x)^n for n>=0.
%o A124463 (PARI) {a(n)=local(m=max(n,3),R=vector(m+1,r,vector(m+1,c,binomial(r+c-2,c-1)))); for(i=0,m,for(r=0,m,R[r+1]=Vec(sum(c=0,m,x^c*Ser(R[c+1])^r+O(x^(m+1))))));R[4][n+1]}
%Y A124463 Cf. A124460 (table); other rows: A124461, A124462, A124464, A124465, A124466.
%K A124463 nonn
%O A124463 0,2
%A A124463 _Paul D. Hanna_, Nov 03 2006