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 A026900 #4 Mar 30 2012 18:56:11 %S A026900 1,8,47,248,1251,6194,30496,150348,745086,3719388,18721063,95045190, %T A026900 486669349,2512426480,13070589618,68484870582,361191120212, %U A026900 1916337714194,10222616034264,54800827268454,295084855980404,1595368824989782 %N A026900 T(2n+1,n+3), T given by A026780. %K A026900 nonn %O A026900 2,2 %A A026900 _Clark Kimberling_