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 A191171 #4 Mar 30 2012 18:57:30 %S A191171 1,2,5,9,10,14,19,21,26,37,41,46,57,62,77,82,85,91,105,110,122,127, %T A191171 149,165,170,172,185,190,229,230,235,249,254,309,314,329,334,341,365, %U A191171 370,415,421,441,446,489,494,509,514,554,559,597,661,681,686,689,694,739,741,746,761,766,820,917 %N A191171 Integers in (-1+A191123)/4; contains A191123 as a proper subsequence. %C A191171 See A191123. %t A191171 (See A191123.) %Y A191171 Cf. A191123. %K A191171 nonn %O A191171 1,2 %A A191171 _Clark Kimberling_, May 27 2011