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 A159962 #6 Jun 23 2021 11:19:14 %S A159962 1,0,3,4,6,2,7,10,9,13,5,8,11,14,12,16,15,17,19,22,18,21,20,25,28,31, %T A159962 34,37,24,23,26,40,29,32,35,38,41,27,43,46,49,44,30,52,47,55,50,58,53, %U A159962 61,56,33,36,64,59,67,70,39,42,73,45,48,76,51,79,62,65,68,54,71,74,77,82 %N A159962 Lodumo_3 of A004602 (expansion of Pi in base 3). %C A159962 Permutation of nonnegative numbers. %Y A159962 Cf. A004602. %K A159962 easy,nonn %O A159962 0,3 %A A159962 _Philippe Deléham_, Apr 28 2009 %E A159962 a(62) changed from 2 to 42 by _R. J. Mathar_, Apr 30 2009