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 A125988 #8 Mar 22 2016 04:54:52 %S A125988 0,1,2,3,4,7,5,6,8,9,16,12,17,21,10,13,11,14,20,18,15,19,22,23,42,30, %T A125988 45,56,26,35,31,44,58,48,46,57,63,24,32,27,33,50,25,29,28,37,53,47,40, %U A125988 54,62,43,36,34,38,41,49,39,51,61,59,55,52,60,64,65,121,84,128,163,72 %N A125988 Signature-permutation of the square of A125986. %H A125988 J. Vaillé, <a href="http://dx.doi.org/10.1006/eujc.1996.0089">Une Bijection Explicative de Plusieurs Propriétés Remarquables des Ponts</a>, European J. Combin. 18 (1997), no. 1, 117-124. %H A125988 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %Y A125988 Inverse: A125987. a(n) = A125986(A125986(n)). %K A125988 nonn %O A125988 0,3 %A A125988 _Antti Karttunen_, Jan 02 2007