OFFSET
1,6
LINKS
R. D. Chatham, The N+k Queens Problem Page.
R. D. Chatham, G. H. Fricke and R. D. Skaggs, The Queens Separation Problem, Utilitas Mathematica 69 (2006), 129-141.
R. D. Chatham, M. Doyle, G. H. Fricke, J. Reitmann, R. D. Skaggs and M. Wolff, Indepe ndence and Domination Separation in Chessboard Graphs, Journal of Combinatorial Mathematics and Combinatorial Computing, to appear.
EXAMPLE
For n=6 the a(6)=2 solutions are
. . Q . . . . . Q . . .
Q . P . . Q Q . P . . Q
. . . Q . . . . Q . . .
. Q . . . . . . . . Q .
. . . . Q . . Q . . . .
. . Q . . . . . . Q . .
CROSSREFS
KEYWORD
more,nonn
AUTHOR
R. Douglas Chatham (d.chatham(AT)moreheadstate.edu), Jan 31 2005
EXTENSIONS
More terms from R. Douglas Chatham (d.chatham(AT)moreheadstate.edu), Feb 15 2005, Apr 20 2007
STATUS
approved