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 A026335 #4 Mar 30 2012 18:56:06 %S A026335 1,4,21,112,615,3432,19382,110432,633555,3654840,21179389,123195360, %T A026335 718887585,4206458700,24671967210,145008786304,853852037038, %U A026335 5035940194824,29744992814381,175921665090480,1041700117634505,6175002739467276 %N A026335 a(n) = T(2n,n-1), where T is the array in A026323. %K A026335 nonn %O A026335 1,2 %A A026335 _Clark Kimberling_