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 A124561 #3 Mar 30 2012 18:37:01
%S A124561 1,2,3,5,11,35,159,979,7870,80898,1050628,17117967,348650347,
%T A124561 8866137878,281540044623,11172327581631,554607985588213,
%U A124561 34475080278856486,2685981999907232301,262507094271746005965,32206094635505510590194
%N A124561 Antidiagonal sums of rectangular table A124560.
%C A124561 In table A124560, the g.f. of row n, R_n(y), simultaneously satisfies: R_n(y) = Sum_{k>=0} y^k * [R_{n*k}(y)]^(n*k) for n>=0.
%Y A124561 Cf. A124560.
%K A124561 nonn
%O A124561 0,2
%A A124561 _Paul D. Hanna_, Nov 07 2006