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 A190690 #4 Mar 30 2012 18:57:28 %S A190690 2,3,6,10,14,17,21,25,28,29,32,36,40,43,44,47,51,55,58,59,62,66,69,70, %T A190690 73,77,81,84,85,88,92,96,99,100,103,107,111,114,115,118,122,125,126, %U A190690 129,133,137,140,141,144,148,152,155,156,159,163,167,170,171,174,178,181,182,185,189,193,196,197,200,204,208,211,212,215,219,223 %N A190690 Positions of 1 in A190688. %C A190690 See A190688. %t A190690 (See A190688.) %Y A190690 Cf. A190668. %K A190690 nonn %O A190690 1,1 %A A190690 _Clark Kimberling_, May 17 2011