login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A104003 (3/4)*(27*n^2-137*n+180)*n^(n-6)*(2*n-6)!/(n-3)!. 0
6, 306, 29700, 4798080, 1178634240, 412483246560, 195891696000000, 121597736131872000, 95776583838282547200, 93456899248404570278400, 110767880742079885561036800, 156855803355661410000000000000, 261695274412151118929854464000000, 508262037307349207558239385902080000 (list; graph; refs; listen; history; text; internal format)
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, 85-107.

LINKS

Table of n, a(n) for n=4..17.

D. Zvonkine, Home Page

PROG

(PARI) a(n)=(3/4)*(27*n^2-137*n+180)*n^(n-6)*(2*n-6)!/(n-3)! \\ 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 4 16:41 EST 2022. Contains 358563 sequences. (Running on oeis4.)