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 A086964 #6 Mar 30 2012 18:50:37 %S A086964 2,1,3,6,10,4,14,8,12,5,22,9,26,7,15,20,34,30,38,16,21,11,46,24,25,13, %T A086964 45,42,58,18,62,40,33,17,245,36,74,19,39,32,82,28,86,66,27,23,94,48, %U A086964 98,60,51,78,106,54,110,56,57,29,118,50,122,31,147,80,130,44,134 %N A086964 a(A086957(n))=A086958(n), a(A086958(n))=A086957(n), a(A086959(n))=A086959(n), see A086956. %C A086964 A self-inverse permutation of natural numbers: a(a(n))=n; %C A086964 a(n) = A086962(A086963(n)) = A086963(A086962(n)). %H A086964 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A086964 Cf. A086572, A086571. %K A086964 nonn %O A086964 1,1 %A A086964 _Reinhard Zumkeller_, Jul 25 2003