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 A191187 #4 Mar 30 2012 18:57:31 %S A191187 1,3,6,7,9,15,21,27,31,33,39,45,60,63,69,81,87,93,111,117,127,135,141, %T A191187 159,183,189,195,243,249,255,261,279,285,303,327,333,351,357,375,381, %U A191187 405,411,447,471,477,511,543,546,549,567,573,627,639,729,735,759,765,783,789,837 %N A191187 Integers in (-3+A191131)/4; contains A191131 as a proper subsequence. %C A191187 See A191131. %t A191187 (See A191131.) %Y A191187 Cf. A191131, A191113. %K A191187 nonn %O A191187 1,2 %A A191187 _Clark Kimberling_, May 27 2011