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A006432
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Tree-rooted planar maps.
(Formerly M3166)
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0
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0, 3, 60, 650, 5352, 37681, 239752, 1421226, 7996160, 43219990, 226309800, 1154900708
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Walsh, T. R. S.; Lehman, A. B.; Counting rooted maps by genus. III: Nonseparable maps. J. Combinatorial Theory Ser. B 18 (1975), 222-259.
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FORMULA
| a(n) seems to be divisible by n+1. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 01 2003
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CROSSREFS
| Sequence in context: A183286 A195560 A002738 * A195550 A144659 A115490
Adjacent sequences: A006429 A006430 A006431 * A006433 A006434 A006435
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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