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Search: id:A006468
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| A006468 |
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Number of rooted planar maps.
(Formerly M3984)
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+0
2
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| 5, 37, 150, 449, 1113, 2422, 4788, 8790, 15213, 25091, 39754, 60879
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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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
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G.f.: (5+2x-4x^2+x^3)/(x-1)^7 (conjectured). - Ralf Stephan, Apr 23 2004
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CROSSREFS
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Sequence in context: A142036 A089195 A023289 this_sequence A144954 A146195 A095924
Adjacent sequences: A006465 A006466 A006467 this_sequence A006469 A006470 A006471
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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