OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
F. Michel Dekking, Jeffrey Shallit, and N. J. A. Sloane, Queens in exile: non-attacking queens on infinite chess boards, Electronic J. Combin., 27:1 (2020), #P1.52.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 12 2016
EXTENSIONS
More terms from Alois P. Heinz, Jul 12 2016
STATUS
approved