A279116 Number of non-equivalent ways to place 7 non-attacking kings on an n X n board.

0, 0, 0, 0, 39, 6472, 311552, 5576682, 56289710, 389130774, 2059061646, 8924241327, 33134160010, 108698226956, 322211640480

Offset: 1

Author

Heinrich Ludwig, Dec 10 2016

Keywords

• nonn
• more

Comments

Rotations and reflections of placements are not counted. If they are to be counted, see A194788.

Examples

			There are 39 non-equivalent ways to place 7 non-attacking kings on a 5 X 5 board, e.g., this one:
   K...K
   .....
   K.K.K
   .....
   K...K
		

Crossrefs

Cf. A194788, A279111 (2 kings), A279112 (3 kings), A279113 (4 kings), A279114 (5 kings), A279115 (6 kings), A279117, A236679.