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 A026874 #4 Mar 30 2012 18:56:11 %S A026874 1,8,46,233,1109,5102,23020,102718,455608,2015496,8912244,39452385, %T A026874 175026904,778762339,3476922430,15581908258,70108401416,316728595048, %U A026874 1436752952543,6543920192177,29923907812601,137363507432013,632899405886519 %N A026874 T(2n,n+3), T given by A026758. %K A026874 nonn %O A026874 3,2 %A A026874 _Clark Kimberling_