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 A026677 #6 Apr 30 2014 01:31:13 %S A026677 1,2,5,10,23,46,103,206,455,910,1993,3986,8679,17358,37633,75266, %T A026677 162643,325286,701075,1402150,3015563,6031126,12948083,25896166, %U A026677 55513327,111026654,237705547,475411094,1016736115,2033472230 %N A026677 T(n,0) + T(n,1) + ... + T(n,n), T given by A026670. %F A026677 G.f.: F(x^2) + 2xF(x^2), where xF(x) = g.f. of A054441. - _Ralf Stephan_, Feb 05 2004 %Y A026677 Partial sums of A026733. %K A026677 nonn %O A026677 0,2 %A A026677 _Clark Kimberling_