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 A124557 #3 Mar 30 2012 18:37:01
%S A124557 1,1,7,91,1899,57876,2447115,139777303,10629219251,1066463205220,
%T A124557 140409644914798,24185696469330452,5439617764120907676,
%U A124557 1594552369099740836202,608364562372792302094447
%N A124557 Main diagonal of table A124550.
%C A124557 In table A124550, the g.f. of row n, R_n(y), simultaneously satisfies: R_n(y) = [ Sum_{k>=0} y^k * R_{n*k}(y) ]^n for n>=0.
%Y A124557 Cf. A124550 (table); A124558, A124559; A124551, A124552, A124554, A124555, A124556.
%K A124557 nonn
%O A124557 0,3
%A A124557 _Paul D. Hanna_, Nov 07 2006