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 A190442 #4 Mar 30 2012 18:57:28 %S A190442 4,7,12,15,20,25,28,33,38,41,46,49,54,59,62,67,70,72,75,80,83,88,93, %T A190442 96,101,104,109,114,117,122,125,127,130,135,138,143,148,151,156,159, %U A190442 164,169,172,177,182,185,190,193,198,203,206,211,214,216,219,224,227,232,237,240,245,248,253,258,261,266,269,271,274,279,282,287,292,295,300 %N A190442 Positions of 1 in A190440. %C A190442 See A190440. %t A190442 (See A190440.) %Y A190442 Cf. A190440. %K A190442 nonn %O A190442 1,1 %A A190442 _Clark Kimberling_, May 10 2011