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A279117
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Number of non-equivalent ways to place n non-attacking kings on an n X n board.
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7
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OFFSET
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1,3
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COMMENTS
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Rotations and reflections of placements are not counted. If they are to be counted, see A201513.
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LINKS
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Table of n, a(n) for n=1..10.
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EXAMPLE
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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
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CROSSREFS
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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
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KEYWORD
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nonn,more
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AUTHOR
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Heinrich Ludwig, Dec 10 2016
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STATUS
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approved
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