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 A086963 #6 Mar 30 2012 18:50:37 %S A086963 3,2,1,8,25,6,21,4,15,10,33,12,39,14,9,24,51,36,57,20,7,22,69,16,5,26, %T A086963 54,56,87,30,93,48,11,34,280,18,111,38,13,40,123,42,129,88,45,46,141, %U A086963 32,343,70,17,104,159,27,275,28,19,58,177,60,183,62,168,112,325 %N A086963 a(A086957(n))=A086959(n), a(A086958(n))=A086958(n), a(A086959(n))=A086957(n), see A086956. %C A086963 A self-inverse permutation of natural numbers: a(a(n))=n; %C A086963 a(n) = A086962(A086963(n)) = A086963(A086962(n)). %H A086963 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A086963 Cf. A086572, A086571. %K A086963 nonn %O A086963 1,1 %A A086963 _Reinhard Zumkeller_, Jul 25 2003