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 A204913 #6 Feb 27 2013 09:44:09 %S A204913 1,2,5,9,6,5,4,14,13,14,15,9,8,7,13,27,18,20,21,14,27,65,12,27,41,16, %T A204913 44,27,83,20,28,44,15,18,35,44,60,38,34,14,26,27,97,65,13,12,11,27,52, %U A204913 54,18,16,129,44,65,27,21,109,29,35 %N A204913 Least k such that n divides the k-th difference between distinct double factorials. %C A204913 For a guide to related sequences, see A204892. %t A204913 (See the program at A204982.) %Y A204913 Cf. A204982, A204892. %K A204913 nonn %O A204913 1,2 %A A204913 _Clark Kimberling_, Jan 22 2012