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 A126009 #7 Mar 31 2012 13:21:13 %S A126009 0,2,1,3,9,10,8,12,6,4,5,11,7,17,18,19,20,13,14,15,16,21 %N A126009 Self-inverse permutation of integers induced when A106485 is restricted to A126011. %C A126009 The Scheme-program given cannot in practice compute this further than n=21, as A106485(A126011(22))=36893488147419103232. However, the further terms could be deduced by other means. This sequence is a permutation of the nonnegative integers because combinatorial games form a group under (game) addition and each game has a well-defined, unique negative. %H A126009 A. Karttunen, <a href="/A126000/a126000.scm.txt">Scheme-program for computing this sequence.</a> %H A126009 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A126009 a(n) = A126013(A106485(A126011(n))). %K A126009 nonn %O A126009 0,2 %A A126009 _Antti Karttunen_, Jan 02 2007 %E A126009 Typos corrected by _Franklin T. Adams-Watters_, Apr 06 2009