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 A026867 #4 Mar 30 2012 18:56:11 %S A026867 1,8,46,234,1124,5241,24050,109429,495884,2244060,10158768,46055322, %T A026867 209247370,953184750,4354605139,19954396521,91721631238,422908476612, %U A026867 1955876264342,9072401893299,42203220058991,196862017041783,920700735516741 %N A026867 T(2n+1,n+3), T given by A026747. %K A026867 nonn %O A026867 2,2 %A A026867 _Clark Kimberling_