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 A085172 #7 Mar 31 2012 14:02:19 %S A085172 0,1,2,3,4,7,5,6,8,9,17,10,16,21,11,18,12,14,20,13,15,19,22,23,45,24, %T A085172 44,58,25,46,26,42,57,27,43,56,63,28,48,29,47,59,30,49,31,37,54,35,38, %U A085172 53,62,33,50,32,39,55,34,40,51,61,36,41,52,60,64,65,129,66,128,170 %N A085172 Inverse permutation to A085171. %H A085172 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete Scheme source) %H A085172 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations induced by Catalan automorphisms</a> %Y A085172 Inverse: A085171. Cf. also A085163, A085164, A085203. %K A085172 nonn %O A085172 0,3 %A A085172 _Antti Karttunen_, Jun 23 2003