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 A088045 #4 Dec 05 2013 19:56:32 %S A088045 1,3,6,7,9,10,0,11,0,12,14,0,0,15,0,0,0,0,17,0,0,18,0,0,20,0,0,0,0,21, %T A088045 0,0,0,22,0,0,0,23,0,24,0,0,0,0,0,25,0,0,0,0,0,0,0,26,0,0,0,0,0,27,0, %U A088045 0,28,0,0,0,0,0,0,0,0,0,0,29,0,0,0,0,0,0,30,0,0,0,31,0,0,0,0,0,32,0,0,0,0,0 %N A088045 Smallest k such that A088044(k) = n, or 0 if no such k exists. %Y A088045 Cf. A088044. %K A088045 nonn %O A088045 1,2 %A A088045 _Amarnath Murthy_, Sep 20 2003 %E A088045 More terms from _David Wasserman_, Jun 21 2005