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A279117 Number of non-equivalent ways to place n non-attacking kings on an n X n board. 7
1, 0, 2, 14, 273, 7855, 311552, 14895797, 831959075, 52959962415 (list; graph; refs; listen; history; text; internal format)
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: A280517 A015197 A156910 * A018803 A217474 A132695

Adjacent sequences:  A279114 A279115 A279116 * A279118 A279119 A279120

KEYWORD

nonn,more

AUTHOR

Heinrich Ludwig, Dec 10 2016

STATUS

approved

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Last modified April 23 09:35 EDT 2019. Contains 322385 sequences. (Running on oeis4.)