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 A191207 #4 Mar 30 2012 18:57:31 %S A191207 1,3,5,9,11,15,17,19,27,33,35,43,45,51,53,57,59,67,75,81,99,105,107, %T A191207 129,131,135,139,153,159,161,171,177,179,201,203,211,225,227,235,243, %U A191207 267,297,299,315,321,323,387,393,395,405,417,419,427,459,477,483,485,513,515,523,531,537,539,555,603,609,611,633,635,643,675,681 %N A191207 Integers in (1+A191141)/4; contains A191141 as a proper subsequence. %C A191207 See A191141. %t A191207 (See A191141.) %Y A191207 Cf. A191141, A191113. %K A191207 nonn %O A191207 1,2 %A A191207 _Clark Kimberling_, May 28 2011