OFFSET
1,8
COMMENTS
Conjectured recurrence order is 477 (see "Non-attacking chess pieces", p. 19). - Vaclav Kotesovec, Dec 19 2014
LINKS
S. Chaiken, C. R. H. Hanusa and T. Zaslavsky, A q-Queens Problem, I. General theory, arXiv:1303.1879 [math.CO], 2013-2014.
V. Kotesovec, Non-attacking chess pieces, 6ed, 2013
Antal Pinter, Combinatorics, software for enumerating positions of non-attacking chess pieces.
I. Rivin, I. Vardi and P. Zimmermann, The n-queens problem, Amer. Math. Monthly, 101 (1994), 629-639.
FORMULA
a(n) = n^16/40320 - n^15/432 + 221*n^14/2160 + O(n^13). - Vaclav Kotesovec, Dec 19 2014
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Antal Pinter, Dec 18 2014
EXTENSIONS
a(16) from Vaclav Kotesovec, Dec 19 2014
a(17) from Vaclav Kotesovec, Dec 20 2014
STATUS
approved