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A011272
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Hybrid binary rooted trees with n nodes whose root is labeled by "a".
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2
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0, 1, 3, 13, 64, 339, 1885, 10851, 64109, 386510, 2368354, 14706331, 92337618, 585239903, 3739309053, 24059542845, 155756019048, 1013801283133, 6630587014935, 43553555324502
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| N. S. S. Gu, N. Y. Li and T. 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.
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LINKS
| Index entries for sequences related to rooted trees
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FORMULA
| A007863 - A011270.
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CROSSREFS
| Sequence in context: A202837 A180111 A006923 * A200719 A065065 A020086
Adjacent sequences: A011269 A011270 A011271 * A011273 A011274 A011275
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KEYWORD
| nonn
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AUTHOR
| pallo(AT)u-bourgogne.fr (Jean Pallo)
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