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 A191206 #4 Mar 30 2012 18:57:31 %S A191206 1,3,5,11,17,19,35,43,53,59,67,75,99,107,131,139,161,171,179,203,211, %T A191206 227,235,267,299,323,355,395,419,427,485,515,523,539,555,611,635,643, %U A191206 683,707,715,739,803,811,843,899,907,939,971,1067,1123,1187,1195,1251,1259,1283,1291,1457 %N A191206 Integers in (-2+A191141)/3; contains A191141 as a proper subsequence. %C A191206 See A191141. %t A191206 (See A191141.) %Y A191206 Cf. A191141, A191113. %K A191206 nonn %O A191206 1,2 %A A191206 _Clark Kimberling_, May 28 2011