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 A191339 #4 Mar 30 2012 18:57:32 %S A191339 3,9,10,15,16,25,26,31,32,38,41,47,48,53,54,60,63,69,70,75,76,85,91, %T A191339 92,98,107,108,113,114,120,123,129,130,135,136,142,145,151,152,157, %U A191339 158,167,173,174,180,189,190,195,196,202,205,211,212,217,218,224,227,233,234,239,240,249,250,255,256,262,271,272,277,278,284,287 %N A191339 Positions of 2 in A191336. %C A191339 See A191336. %t A191339 (See A191339.) %Y A191339 Cf. A191339, A191329. %K A191339 nonn %O A191339 1,1 %A A191339 _Clark Kimberling_, Jun 01 2011