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A006469
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Number of rooted planar maps.
(Formerly M4727)
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0
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OFFSET
| 1,1
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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
| G.f.:1/(x-1)^7*(3*x^2-9*x-10), in S. Plouffe Master thesis, Uqam 1992.
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CROSSREFS
| Sequence in context: A153596 A056986 A160655 * A081905 A016138 A006329
Adjacent sequences: A006466 A006467 A006468 * A006470 A006471 A006472
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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