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A006386
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Number of unrooted maps with n edges on the torus.
(Formerly M4253)
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2
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1, 6, 46, 452, 4852, 52972, 587047, 6550808, 73483256, 827801468, 9360123740, 106189359544, 1208328304864, 13787042250528, 157700137398689, 1807893066408464, 20768681225892328, 239037464947999900
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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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.; Generating nonisomorphic maps without storing them. SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
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LINKS
| T. D. Noe, Table of n, a(n) for n=2..30 (from Mednykh and Nedela)
A. D. Mednykh and R. Nedela, Enumeration of unrooted maps with given genus, preprint (submitted to J. Combin. Th. B).
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CROSSREFS
| Cf. A006300.
Sequence in context: A052781 A049378 A001829 * A094655 A015865 A145506
Adjacent sequences: A006383 A006384 A006385 * A006387 A006388 A006389
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KEYWORD
| nice,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Valery A. Liskovets (liskov(AT)im.bas-net.by), Mar 22 2005
Edited by N. J. A. Sloane (njas(AT)research.att.com), May 23 2008
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