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 A086962 #6 Mar 30 2012 18:50:37 %S A086962 1,3,2,4,5,8,7,6,9,25,11,15,13,21,12,16,17,18,19,24,14,33,23,20,10,39, %T A086962 27,28,29,36,31,32,22,51,35,30,37,57,26,48,41,56,43,44,54,69,47,40,49, %U A086962 50,34,52,53,45,55,42,38,87,59,70,61,93,63,64,65,88,67,68,46 %N A086962 a(A086957(n))=A086957(n), a(A086958(n))=A086959(n), a(A086959(n))=A086958(n), see A086956. %C A086962 A self-inverse permutation of natural numbers: a(a(n))=n; %C A086962 a(n) = A086962(A086963(n)) = A086963(A086962(n)). %H A086962 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A086962 Cf. A086572, A086571. %K A086962 nonn %O A086962 1,2 %A A086962 _Reinhard Zumkeller_, Jul 25 2003