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 A191210 #4 Mar 30 2012 18:57:31 %S A191210 1,5,17,21,53,65,69,85,113,161,197,209,213,257,261,277,341,369,485, %T A191210 593,629,641,645,773,785,789,833,837,853,1025,1029,1045,1109,1137, %U A191210 1365,1393,1457,1781,1889,1925,1937,1941,2321,2357,2369,2373 %N A191210 Integers in (-2+A191143)/3; contains A191143 as a proper subsequence. %C A191210 See A191143. %t A191210 (See A191143.) %Y A191210 Cf. A191143, A191113. %K A191210 nonn %O A191210 1,2 %A A191210 _Clark Kimberling_, May 28 2011