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.
0, 0, 0, 0, 0, 0, 0, 8, 44, 528, 5976, 77896, 1052884, 13666360
Offset: 1
Examples
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.
Links
- R. D. Chatham, The N+k Queens Problem Page.
- 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.