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A006434 Tree-rooted toroidal maps.
(Formerly M3708)
0
4, 120, 1230, 7424, 32424, 113584, 338742, 893220, 2136618, 4721728, 9770904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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.

LINKS

Table of n, a(n) for n=1..11.

FORMULA

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

CROSSREFS

Sequence in context: A096464 A064204 A054644 * A002702 A068204 A203033

Adjacent sequences:  A006431 A006432 A006433 * A006435 A006436 A006437

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified June 18 03:02 EDT 2013. Contains 226328 sequences.