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 A125978 #5 Mar 31 2012 13:21:12 %S A125978 0,1,2,3,4,7,5,6,8,9,17,12,16,21,10,18,11,14,20,13,15,19,22,23,45,31, %T A125978 44,58,26,49,30,42,57,35,48,56,63,24,46,32,43,59,25,47,28,37,54,34,40, %U A125978 53,62,27,50,29,38,55,33,39,51,61,36,41,52,60,64,65,129,87,128,170,73 %N A125978 Signature-permutation of a Catalan automorphism: composition of A125976 and A057163. %H A125978 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A125978 Inverse: A125977. a(n) = A125976(A057163(n)). %K A125978 nonn %O A125978 0,3 %A A125978 _Antti Karttunen_, Jan 02 2007