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A275869 Number of nonequivalent ways to place k>=0 nonattacking kings on an n X n board. 2
2, 2, 11, 51, 922, 25618, 1597350, 169413040, 33716225195, 11838480390673, 7588965091313449, 8705702554970941096, 18079208010076976255573, 67519585404524909086260614, 455193583190737164106702088892, 5527752160260327852724215089473548 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also number of nonequivalent ways to tile an n+1 X n+1 square with 1 X 1 and 2 X 2 tiles.

Also row sum of triangle A236679.

Rotations and reflections of a placement are not counted. If they are to be counted, see A063443.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..30

CROSSREFS

Cf. A236679, A063443.

Sequence in context: A192824 A184237 A069648 * A175976 A095215 A264712

Adjacent sequences:  A275866 A275867 A275868 * A275870 A275871 A275872

KEYWORD

nonn

AUTHOR

Heinrich Ludwig, Dec 11 2016

EXTENSIONS

a(10)-a(16) from Andrew Howroyd, May 30 2017

STATUS

approved

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Last modified October 18 06:50 EDT 2021. Contains 348066 sequences. (Running on oeis4.)