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Search: id:A011272
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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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+0
3
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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; listen)
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OFFSET
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0,3
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REFERENCES
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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
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Index entries for sequences related to rooted trees
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FORMULA
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A007863 - A011270.
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CROSSREFS
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Sequence in context: A007855 A107097 A006923 this_sequence A065065 A020086 A151987
Adjacent sequences: A011269 A011270 A011271 this_sequence A011273 A011274 A011275
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KEYWORD
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nonn
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AUTHOR
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pallo(AT)u-bourgogne.fr (Jean Pallo)
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