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A134164
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8*(6*n^2-37*n+60)*n^(n-7)*(2*n-7)!/(n-4)!.
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0
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1, 48, 4320, 638400, 143216640, 45912303360, 20064844800000, 11517786190310400, 8429182295998464000, 7676025035655591014400, 8524944488872455752908800, 11353372433362159200000000000, 17873609218353722680651284480000, 32855463684946243953215776972800000, 69770867798960701944675685147607040000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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REFERENCES
| Lando S. K. and Zvonkine D., Counting ramified coverings and intersection theory on Hurwitz spaces I (cohomological identities). Moscow Mathematical Journal, vol. 7 (2007), no. 1, 85-107.
Zvonkine D., Counting ramified coverings and intersection theory on Hurwitz spaces II (local structure of Hurwitz spaces and combinatorial results). Moscow Mathematical Journal, vol. 7 (2007), no. 1, 135-162.
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LINKS
| D. Zvonkine, Home Page
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CROSSREFS
| Sequence in context: A033475 A053060 A004034 * A098209 A174755 A114721
Adjacent sequences: A134161 A134162 A134163 * A134165 A134166 A134167
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 30 2008
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