OFFSET
1,9
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 (19, -171, 969, -3876, 11628, -27132, 50388, -75582, 92378, -92378, 75582, -50388, 27132, -11628, 3876, -969, 171, -19, 1).
FORMULA
a(n) = 9!*binomial(n,9)^2.
G.f.: -362880*x^9*(x +1)*(x^8 +80*x^7 +1216*x^6 +5840*x^5 +10036*x^4 +5840*x^3 +1216*x^2 +80*x +1) / (x -1)^19. - Colin Barker, Jan 08 2013
PROG
(PARI) a(n) = 9! * binomial(n, 9)^2 \\ Andrew Howroyd, Feb 13 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Thomas Zaslavsky, Jun 28 2010
STATUS
approved