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 A080292 #5 Jan 11 2024 09:24:58 %S A080292 1,3,9,9,81,81,81,27,1701,1701,1701,1701,2673,2673,891,891 %N A080292 Orbit size of each tree A080293(n) under Donaghey's "Map M" Catalan automorphism. %C A080292 This is the size of the cycle containing A080295(n) in the permutations A057505/A057506. %F A080292 a(n) = A080967(A080295(n)) %Y A080292 A080977(n) = A080272(2*n)/a(n). A080302(n) = a(n)/3 for n>0. Cf. A080973/A080975. %K A080292 nonn,more %O A080292 0,2 %A A080292 _Antti Karttunen_, Mar 02 2003