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 A191270 #5 Mar 30 2012 18:57:31 %S A191270 3,6,11,14,19,21,24,27,32,35,40,42,45,48,53,58,61,66,69,74,76,79,82, %T A191270 87,90,95,97,100,103,108,113,116,121,124,129,131,134,137,142,144,147, %U A191270 150,155,158,163,165,168,171,176,179,184,186,189,192,197,202,205,210,213,218,220,223,226,231,234,239,241,244,247,252,257,260,265 %N A191270 Positions of 1 in A191269. %C A191270 See A191269. %t A191270 (See A191269.) %Y A191270 Cf. A191269, A191250. %K A191270 nonn %O A191270 1,1 %A A191270 _Clark Kimberling_, May 28 2011