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A104592
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Number of labeled non-planar projective-planar 2-connected graphs without a K_{3,3}-subdivision and with n vertices.
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3
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1, 120, 10920, 988960, 99706320, 11897978400, 1729153068720, 306003079514880, 64657337524631280, 15890834362452489440, 4435396700216405763840, 1379778057502074926142720, 471689356958791639787042560
(list; graph; refs; listen; history; internal format)
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OFFSET
| 5,2
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COMMENTS
| By empirical evidence, the terms possess a curious prime factor behavior. E.g. 2^7*3^2*5*11*17*19 divides a(19)=70291642269058321415718042668160.
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LINKS
| A. Gagarin et al., Table of n, a(n) for n = 5..20
A. Gagarin, G. Labelle and P. Leroux, Counting labeled projective-planar graphs without a K_{3,3}-subdivision, 0406140.htm
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CROSSREFS
| Cf. A104593, A135340.
Sequence in context: A001785 A156411 A076005 * A135379 A059063 A121012
Adjacent sequences: A104589 A104590 A104591 * A104593 A104594 A104595
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KEYWORD
| nonn
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AUTHOR
| Valery A. Liskovets (liskov(AT)im.bas-net.by), Mar 22 2005
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