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 A190453 #4 Mar 30 2012 18:57:28 %S A190453 2,7,12,15,20,23,28,33,36,41,44,46,49,54,57,62,67,70,75,78,83,88,91, %T A190453 96,101,104,109,112,117,122,125,130,133,135,138,143,146,151,156,159, %U A190453 164,167,172,177,180,185,190,193,198,201,206,211,214,219,222,224,227,232,235,240,245,248,253,256,261,266,269 %N A190453 Positions of 1 in A190451. %C A190453 See A190451. %t A190453 (See A190451.) %Y A190453 Cf. A190451. %K A190453 nonn %O A190453 1,1 %A A190453 _Clark Kimberling_, May 10 2011