OFFSET
4,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 4..100
S. K. Lando and D. Zvonkine, Counting ramified coverings and intersection theory on Hurwitz spaces I (cohomological identities), Moscow Mathematical Journal, vol. 7 (2007), no. 1, 85-107.
D. Zvonkine, 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.
D. Zvonkine, Home Page
MATHEMATICA
Table[ 8*(6*n^2 - 37*n + 60)*n^(n - 7)*(2*n - 7)!/(n - 4)!, {n, 4, 50}] (* G. C. Greubel, May 30 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 30 2008
STATUS
approved