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A032200 Number of rooted compound windmills (mobiles) of n nodes. 7
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; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Camb. 1998, p. 241 (3.3.84).

LINKS

Table of n, a(n) for n=1..28.

C. G. Bower, Transforms (2)

Index entries for sequences related to mobiles

FORMULA

Shifts left under "CIK" (necklace, indistinct, unlabeled) transform.

CROSSREFS

Cf. A029768, A038037, A055340.

Sequence in context: A171887 A027881 A002861 * A130969 A264293 A034750

Adjacent sequences:  A032197 A032198 A032199 * A032201 A032202 A032203

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified February 21 02:19 EST 2018. Contains 299388 sequences. (Running on oeis4.)