A279117 Number of non-equivalent ways to place n non-attacking kings on an n X n board.

1, 0, 2, 14, 273, 7855, 311552, 14895797, 831959075, 52959962415

Offset

1,3

Comments

Rotations and reflections of placements are not counted. If they are to be counted, see A201513.

Links

Table of n, a(n) for n=1..10.

Example

There are 14 non-equivalent ways to place 4 non-attacking kings on a 4 X 4 board, e.g., this one:
   K..K
   ....
   ....
   K..K

Crossrefs

Cf. A201513, A279111 (2 kings), A279112 (3 kings), A279113 (4 kings), A279114 (5 kings), A279115 (6 kings), A279116 (7 kings), A236679.

Sequence in context: A354511 A015197 A156910 * A018803 A217474 A132695

Adjacent sequences: A279114 A279115 A279116 * A279118 A279119 A279120

Keyword

nonn,more

Author

Heinrich Ludwig, Dec 10 2016

Status

approved