Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A007859
Number of matchings in rooted plane trees on n nodes.
0
0, 1, 4, 18, 84, 405, 2002, 10101, 51844, 269994, 1423784, 7590044, 40846390, 221650195, 1211606190
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..15.
M. Klazar, Twelve countings with rooted plane trees, European Journal of Combinatorics 18 (1997), 195-210; Addendum, 18 (1997), 739-740.
Index entries for sequences related to rooted trees
CROSSREFS
Sequence in context: A151251 A293490 A010849 * A185132 A085923 A110166
Adjacent sequences: A007856 A007857 A007858 * A007860 A007861 A007862
KEYWORD
nonn,more
AUTHOR
Martin Klazar
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified October 21 05:36 EDT 2024. Contains 376969 sequences.
License Agreements, Terms of Use, Privacy Policy