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 A026264 #4 Mar 30 2012 18:56:05 %S A026264 1,2,3,4,6,7,5,8,9,15,10,16,11,17,18,12,13,14,25,26,27,28,19,20,21,22, %T A026264 34,23,35,36,24,37,44,29,45,30,46,47,31,32,33,53,54,55,56,38,39,40,41, %U A026264 63,42,64,65,43,66,72,73,48,74,49,75,50,51 %N A026264 (1/2)*(s(n) + 1), where s(n) is the n-th odd number in A026262. %K A026264 nonn %O A026264 1,2 %A A026264 _Clark Kimberling_