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A011272
Hybrid binary rooted trees with n nodes whose root is labeled by "a".
2
0, 1, 3, 13, 64, 339, 1885, 10851, 64109, 386510, 2368354, 14706331, 92337618, 585239903, 3739309053, 24059542845, 155756019048, 1013801283133, 6630587014935, 43553555324502
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..19.
Nancy S. S. Gu, Nelson Y. Li, and Toufik Mansour,
2-Binary trees: bijections and related issues
, Discr. Math., 308 (2008), 1209-1221.
J. M. Pallo,
On the listing and random generation of hybrid binary trees
, International Journal of Computer Mathematics, 50 (1994) 135-145.
Index entries for sequences related to rooted trees
FORMULA
a(n) =
A007863
(n) -
A011270
(n).
CROSSREFS
Sequence in context:
A372507
A283667
A391125
*
A367062
A366026
A200719
Adjacent sequences:
A011269
A011270
A011271
*
A011273
A011274
A011275
KEYWORD
nonn
AUTHOR
Jean Pallo (pallo(AT)u-bourgogne.fr)
STATUS
approved
