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 A190848 #4 Mar 30 2012 18:57:29 %S A190848 1,5,9,17,21,29,33,37,53,57,65,69,85,89,101,105,113,117,129,133,149, %T A190848 161,173,177,197,201,209,213,225,229,257,261,269,277,305,317,321,341, %U A190848 345,353,357,389,393,401,405,417,421,449,453,469,485,513,517,521,533,537,593,597,605,609,629,633,641,645,677,681,689,693,705,709 %N A190848 Integers in (-2+A190806)/3; contains A190806 as a proper subsequence. %C A190848 See A190803. %t A190848 (See A190806.) %Y A190848 Cf. A190803, A190806. %K A190848 nonn %O A190848 1,2 %A A190848 _Clark Kimberling_, May 25 2011