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Search: id:A032200
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| A032200 |
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Number of rooted compound windmills (mobiles) of n nodes. |
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8
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| 1, 1, 2, 4, 9, 20, 51, 128, 345, 940, 2632, 7450, 21434, 62174, 182146, 537369, 1596133, 4767379, 14312919, 43162856, 130695821, 397184252, 1211057426, 3703794849, 11358759346, 34923477315, 107627138308, 332404636811
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Camb. 1998, p. 241 (3.3.84).
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LINKS
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C. G. Bower, Transforms (2)
Index entries for sequences related to mobiles
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FORMULA
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Shifts left under "CIK" (necklace, indistinct, unlabeled) transform.
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CROSSREFS
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Cf. A029768, A038037, A055340.
Sequence in context: A134955 A027881 A002861 this_sequence A130969 A034750 A079060
Adjacent sequences: A032197 A032198 A032199 this_sequence A032201 A032202 A032203
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KEYWORD
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nonn,eigen
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net)
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