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 A015701 #12 Mar 30 2012 18:37:41
%S A015701 3,13,233,70673,6068414753,41437343632855438913,
%T A015701 1802124039077579799678906531623816674433,
%U A015701 3276599074530619413746235255317178710800049247052611689171540483148625798281473
%N A015701 From iteration of the Galton-Watson branching process.
%D A015701 S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 295-316.
%t A015701 f[ s_, p_ ] := (1-p)+p s^2; h[ n_, p_, s_ ] := Nest[ f[ #, p ]&, s, n ]; Table[ 2^(2^k-1) h[ k, 1/2, s ]/.s->Sqrt[ 2 ], {k, 7} ]
%K A015701 nonn
%O A015701 0,1
%A A015701 _Wouter Meeussen_