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A007859 Number of matchings in rooted plane trees on n nodes. +0
2
0, 1, 4, 18, 84, 405, 2002, 10101, 51844, 269994, 1423784, 7590044, 40846390, 221650195, 1211606190 (list; graph; listen)
OFFSET

1,3
REFERENCES

M. Klazar, Twelve countings with rooted plane trees, European Journal of Combinatorics 18 (1997), 195-210; Addendum, 18 (1997), 739-740.

LINKS

Index entries for sequences related to rooted trees

CROSSREFS

Sequence in context: A086405 A151251 A010849 this_sequence A085923 A110166 A046885

Adjacent sequences: A007856 A007857 A007858 this_sequence A007860 A007861 A007862

KEYWORD

nonn

AUTHOR

Martin Klazar (klazar(AT)kam.mff.cuni.cz)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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