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 A125980 #5 Mar 31 2012 13:21:12 %S A125980 0,1,3,2,8,5,7,6,4,22,13,18,15,10,21,12,20,19,11,17,16,14,9,64,36,50, %T A125980 41,27,59,32,55,52,29,46,34,38,24,63,35,49,43,26,62,40,61,60,33,48,47, %U A125980 39,25,58,31,57,56,30,54,53,51,28,45,44,42,37,23,196,106,148,120,78 %N A125980 Signature-permutation of a Catalan automorphism: A057163-conjugate of A125976. %C A125980 This is self-inverse permutation (involution) of the nonnegative integers. %H A125980 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A125980 a(n) = A057163(A125976(A057163(n))) = A125977(A057163(n)) = A057163(A125978(n)). %K A125980 nonn %O A125980 0,3 %A A125980 _Antti Karttunen_, Jan 02 2007