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A006434
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Tree-rooted toroidal maps.
(Formerly M3708)
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0
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4, 120, 1230, 7424, 32424, 113584, 338742, 893220, 2136618, 4721728, 9770904
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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LINKS
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Table of n, a(n) for n=1..11.
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FORMULA
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Empirical g.f.: 2*x*(x^6+8*x^5-13*x^4+22*x^3+105*x^2+40*x+2) / (x-1)^10. - Colin Barker, Apr 09 2013
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CROSSREFS
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Sequence in context: A096464 A064204 A054644 * A002702 A068204 A203033
Adjacent sequences: A006431 A006432 A006433 * A006435 A006436 A006437
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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