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 A089417 #9 Jul 09 2025 04:23:12 %S A089417 1,1,1,2,7,6,10,20,37,70,130,272,480,954,1750,3462,6481,12922,24372, %T A089417 48702,92490 %N A089417 Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A082333/A082334. %C A089417 The number of orbits to which the corresponding automorphism(s) partitions the set of A000108(n) binary trees with n internal nodes. %C A089417 Is the non-monotone notch from a(4)=7 to a(5)=6 the only one? %H A089417 A. Karttunen, <a href="/A089408/a089408.c.txt">C-program for computing the initial terms of this sequence</a> %Y A089417 Cf. A089411. %K A089417 nonn %O A089417 0,4 %A A089417 _Antti Karttunen_, Nov 29 2003, Proposed by _Wouter Meeussen_, Spring 2003