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 A026894 #4 Mar 30 2012 18:56:11 %S A026894 1,5,23,106,496,2361,11425,56128,279530,1409242,7182570,36965292, %T A026894 191896092,1003889999,5288020783,28026601758,149362212188, %U A026894 799947847992,4303496405324,23245282077346,126020035603358,685477891161324 %N A026894 T(2n,n+1), T given by A026780. %K A026894 nonn %O A026894 1,2 %A A026894 _Clark Kimberling_