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 A190674 #4 Mar 30 2012 18:57:28 %S A190674 2,3,6,9,10,13,14,17,18,21,24,25,28,29,32,33,35,36,39,40,43,44,47,48, %T A190674 50,51,54,55,58,59,62,65,66,69,70,73,74,77,80,81,84,85,88,89,91,92,95, %U A190674 96,99,100,103,106,107,110,111,114,115,118,121,122,125,126,129,130,132,133,136,137,140,141,144,145,147,148,151,152,155,156 %N A190674 Positions of 1 in A190672. %C A190674 See A190672. %t A190674 (See A190672.) %Y A190674 Cf. A190672. %K A190674 nonn %O A190674 1,1 %A A190674 _Clark Kimberling_, May 16 2011