A007859 Number of matchings in rooted plane trees on n nodes.

0, 1, 4, 18, 84, 405, 2002, 10101, 51844, 269994, 1423784, 7590044, 40846390, 221650195, 1211606190

Offset: 1

Author

Martin Klazar

Keywords

• nonn
• more

Links

• 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