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 A159963 #5 Sep 08 2013 13:31:39 %S A159963 0,3,6,2,1,9,4,12,5,8,11,7,10,14,15,17,13,16,19,18,20,22,23,25,21,24, %T A159963 27,28,26,30,31,33,29,32,35,34,36,38,39,41,37,40,43,42,45,46,44,49,48, %U A159963 51,54,47,52,57,55,60,50,53,63,66,58,56,69,59,61,64,67,72,62,70,65,73,75 %N A159963 Lodumo_3 of A102370 (sloping binary numbers). %C A159963 Permutation of nonnegative numbers. %F A159963 a(n)= lod_3(A102370(n)). %Y A159963 Cf. A102370, A158461. %K A159963 nonn,less,base %O A159963 0,2 %A A159963 _Philippe Deléham_, Apr 28 2009