

A104003


(3/4)*(27*n^2137*n+180)*n^(n6)*(2*n6)!/(n3)!.


0



6, 306, 29700, 4798080, 1178634240, 412483246560, 195891696000000, 121597736131872000, 95776583838282547200, 93456899248404570278400, 110767880742079885561036800, 156855803355661410000000000000, 261695274412151118929854464000000, 508262037307349207558239385902080000
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OFFSET

4,1


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, 85107.


LINKS

Table of n, a(n) for n=4..17.
D. Zvonkine, Home Page


PROG

(PARI) a(n)=(3/4)*(27*n^2137*n+180)*n^(n6)*(2*n6)!/(n3)! \\ Charles R Greathouse IV, May 01 2020


CROSSREFS

Sequence in context: A221850 A229148 A333482 * A280215 A015103 A282373
Adjacent sequences: A104000 A104001 A104002 * A104004 A104005 A104006


KEYWORD

nonn,easy


AUTHOR

N. J. A. Sloane, Jan 30 2008


STATUS

approved



