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 A026913 #4 Mar 30 2012 18:56:11 %S A026913 46,239,993,3927,15327,59613,231733,901220,3507762,13666112,53295628, %T A026913 208049127,812931417,3179338857,12444969357,48753264432,191137360902, %U A026913 749893379292,2944059898632,11565629920632,45462260000880,178803726202404 %N A026913 T(2n-1,n-2), T given by A026907. %K A026913 nonn %O A026913 2,1 %A A026913 _Clark Kimberling_