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 A026650 #4 Mar 30 2012 18:56:09 %S A026650 1,6,21,108,370,1908,6587,34248,119142,623700,2182818,11487528, %T A026650 40391988,213451560,753295635,3993910416,14136717574,75152083716, %U A026650 266650874678,1420670333640,5050926317724,26960309526744,96015725922014 %N A026650 a(n) = T(2n,n-1), T given by A026648. %K A026650 nonn %O A026650 1,2 %A A026650 _Clark Kimberling_