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 A026877 #4 Mar 30 2012 18:56:11 %S A026877 1,5,22,94,399,1696,7243,31122,134623,586324,2570936,11347408, %T A026877 50401287,225215350,1012114200,4572954259,20766382311,94751225278, %U A026877 434246502792,1998426293942,9232496379669,42807004979015,199144155148587 %N A026877 T(2n+1,n+2), T given by A026758. %K A026877 nonn %O A026877 1,2 %A A026877 _Clark Kimberling_