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 A124532 #5 Jun 14 2017 00:11:42
%S A124532 1,1,3,10,39,174,858,4564,25793,153301,951325,6130757,40861658,
%T A124532 280767621,1983859580,14385651988,106878699675,812480791324,
%U A124532 6312686006725,50083418434737,405430892640225,3346568909331984
%N A124532 Row 2 of rectangular table A124530.
%C A124532 In table A124530, the g.f. of row n, R_n(y), simultaneously satisfies: R_n(y) = Sum_{k>=0} y^k*R_k(y)^(n*k) for n>=0.
%F A124532 G.f.: A(x) = Sum_{n>=0} x^n*R_n(x)^(2n), where R_n(x) is the g.f. of row n in table A124530.
%o A124532 (PARI) a(n)=local(R);R=vector(n+3,r,vector(n+3,c,if(r==1 || c<=2,1,r^(c-2)))); for(i=0,n,for(r=0,n,R[r+1]=Vec(sum(c=0,n,x^c*Ser(R[c+1])^(r*c)+O(x^(n+1)))))); R[3][n+1]
%Y A124532 Cf. A124530 (table); other rows: A124531, A124533, A124534, A124535, A124536.
%K A124532 nonn
%O A124532 0,3
%A A124532 _Paul D. Hanna_, Nov 05 2006