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 A126291 #2 Mar 31 2012 13:21:13 %S A126291 1,1,1,2,2,5,8,11,16,23,22,32,44,54 %N A126291 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A125985/A125986. %C A126291 The number of orbits (equivalence classes) to which Vaille's automorphism partitions the set of A000108(n) Dyck paths of semilength n. Note the non-monotone drop from a(9) to a(10). %Y A126291 A126294(2n) = 2*a(2n) for n>0. %K A126291 nonn %O A126291 0,4 %A A126291 _Antti Karttunen_, Jan 02 2007