login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089418 Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082333/A082334. 0
1, 1, 0, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

The number of n-node binary trees fixed by the corresponding automorphism(s).

LINKS

Table of n, a(n) for n=0..20.

A. Karttunen, C-program for computing the initial terms of this sequence

CROSSREFS

Sequence in context: A115527 A050920 A001231 * A274981 A124856 A061858

Adjacent sequences:  A089415 A089416 A089417 * A089419 A089420 A089421

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 29 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)