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 A026860 #4 Mar 30 2012 18:56:11 %S A026860 1,12,95,629,3781,21433,116928,621317,3239925,16662600,84804868, %T A026860 428176176,2148404051,10726889402,53349600116,264499086453, %U A026860 1308025259637,6455291067020,31804649415803,156486128169860,769098411417361 %N A026860 T(2n,n-3), T given by A026747. %K A026860 nonn %O A026860 3,2 %A A026860 _Clark Kimberling_