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 A123715 #6 Mar 31 2012 13:21:12 %S A123715 0,1,2,3,4,8,6,7,5,9,13,20,21,22,14,19,16,17,18,15,11,12,10,23,27,34, %T A123715 35,36,54,55,57,58,59,61,62,63,64,37,41,53,56,60,42,51,44,45,46,47,48, %U A123715 49,50,43,52,39,28,33,40,30,31,32,38,29,25,26,24,65,69,76,77,78,96,97 %N A123715 Signature permutation of a Catalan automorphism: row 79361 of table A122203. %C A123715 This is the signature-permutation of Catalan automorphism which is derived from nonrecursive Catalan automorphism *A123492 with the recursion schema SPINE (defined in A122203). %H A123715 <a href="/index/Per#IntegerPermutationCatAuto">Index entries for signature-permutations of Catalan automorphisms</a> %o A123715 (Scheme function, destructive implementation of this automorphism acting on S-expressions:) (define *A123715! (!SPINE *A123492!)) %Y A123715 Inverse: A123716. Row 79361 of A122203. %K A123715 nonn %O A123715 0,3 %A A123715 _Antti Karttunen_, Oct 11 2006