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A134176
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(3/8)*(n-1)*(n-2)*(27*n^2-137*n+180).
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0
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0, 0, 9, 144, 765, 2475, 6120, 12789, 23814, 40770, 65475, 99990, 146619, 207909, 286650, 385875, 508860, 659124, 840429, 1056780, 1312425, 1611855, 1959804, 2361249, 2821410, 3345750, 3939975, 4610034, 5362119, 6202665, 7138350, 8176095, 9323064, 10586664
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| 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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FORMULA
| O.g.f.: 9*x^3*(1+11*x+15*x^2)/(1-x)^5 . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2008
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MATHEMATICA
| Table[(3/8)(n-1)(n-2)(27n^2-137n+180), {n, 40}] (* From Harvey P. Dale, Mar 23 2011 *)
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CROSSREFS
| Sequence in context: A187402 A050787 A017198 * A067415 A069134 A034829
Adjacent sequences: A134173 A134174 A134175 * A134177 A134178 A134179
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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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