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 A080272 #5 Jan 11 2024 10:24:59 %S A080272 1,3,3,27,54,54,18,1134,1134,1134,1134,1782,1782,594,594,30618,30618, %T A080272 30618,30618,78246,78246,78246,78246,165726,165726 %N A080272 Orbit size of each tree A080263(n) under Donaghey's "Map M" Catalan automorphism. %C A080272 This is the size of the cycle containing A080265(n) in the permutations A057505/A057506. %F A080272 a(n) = A080967(A080265(n)). %Y A080272 A080977(n) = a(2*n)/A080292(n). %K A080272 nonn,more %O A080272 0,2 %A A080272 _Antti Karttunen_, Mar 02 2003