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 A122351 #6 Mar 31 2012 13:21:12 %S A122351 0,1,3,2,7,8,6,4,5,18,17,20,22,21,16,19,14,10,9,15,11,13,12,49,50,48, %T A122351 45,46,55,54,61,63,64,57,62,58,59,47,44,53,60,56,42,51,38,26,27,37,25, %U A122351 23,24,43,52,39,29,28,41,33,35,36,40,30,34,31,32,143,142,146,148,147 %N A122351 Row 1 of A122289 and A122290. An involution of nonnegative integers. %C A122351 The signature-permutation of the automorphism which is derived from the automorphism *A057163 with the recursion schema FORK (see A122201), that is, from the first non-recursive automorphism *A069770 with FORK(FORK(*A069770)) or equivalently, with KROF(KROF(*A069770)) (see A122202). %H A122351 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A122351 A007595 gives the number of orbits in range [A014137(n-1)..A014138(n-1)] of this permutation. %K A122351 nonn %O A122351 0,3 %A A122351 _Antti Karttunen_, Sep 01 2006