OFFSET
1,6
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..200
Christopher R. H. Hanusa, T Zaslavsky, S Chaiken, A q-Queens Problem. IV. Queens, Bishops, Nightriders (and Rooks), arXiv preprint arXiv:1609.00853, a12016
Index entries for linear recurrences with constant coefficients, signature (13,-78,286,-715,1287,-1716,1716,-1287,715,-286,78,-13,1).
FORMULA
a(n) = 6! * binomial(n, 6)^2.
G.f.: -720*x^6*(x^6+36*x^5+225*x^4+400*x^3+225*x^2+36*x+1) / (x-1)^13. - Colin Barker, Jan 08 2013
PROG
(PARI) a(n) = 6! * binomial(n, 6)^2 \\ Andrew Howroyd, Feb 13 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Thomas Zaslavsky, Jun 27 2010
STATUS
approved