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 A026912 #4 Mar 30 2012 18:56:11 %S A026912 13,90,370,1403,5256,19749,74628,283551,1082440,4148594,15953598, %T A026912 61526960,237876562,921678867,3577968072,13913243127,54184698792, %U A026912 211307360862,825059443542,3225071709972,12619275028602,49423455006492 %N A026912 T(2n-1,n-1), T given by A026907. %K A026912 nonn %O A026912 1,1 %A A026912 _Clark Kimberling_