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 A169751 #7 Apr 09 2014 23:44:58 %S A169751 1,3,6,2,7,4,10,17,9,18,8,19,13,25,12,26,11,27,44,35,23,5,24,44,29,50, %T A169751 28,51,33,57,32,58,31,59,30,60,39,15,46,14,47,20,54,89,53,16,54,93,63, %U A169751 103,62,104,61,105,72,36,81,42,88,41,89,40,90,48,99,151,98,152,97,52 %N A169751 A variation on Recamán's sequence A005132: see Comments for definition. %C A169751 Similar to A169748, but now B = 3,6,9,12,15,... (multiples of 3). %K A169751 nonn %O A169751 1,2 %A A169751 _Rodolfo Kurchan_, Apr 08 2010 %E A169751 Corrected and extended by _D. S. McNeil_, May 09 2010