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A129553
Number of ways to place n+3 queens and 3 pawns on an n X n board so that no two queens attack each other.
1
0, 0, 0, 0, 0, 0, 0, 8, 44, 528, 5976, 77896, 1052884, 13666360
OFFSET
1,8
LINKS
R. D. Chatham, M. Doyle, G. H. Fricke, J. Reitmann, R. D. Skaggs and M. Wolff, Independence and Domination Separation in Chessboard Graphs, J. Combin. Math. Combin. Comput. 68 (2009), 3-17.
EXAMPLE
a(4)=0 because when 7 queens are placed on a 4 X 4 board, at least two queens will be adjacent and therefore mutually attacking.
CROSSREFS
Sequence in context: A350128 A028565 A366338 * A174643 A181268 A374281
KEYWORD
more,nonn
AUTHOR
R. Douglas Chatham (d.chatham(AT)moreheadstate.edu), Apr 20 2007
STATUS
approved