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A195648 Number of ways to place 9n nonattacking kings on a 18 x 2n chessboard 6
5120, 1501674, 144605184, 7683664202, 282359109140, 8080813574550, 193194265398240, 4035559337688370, 75925129079783308, 1314578079936797520, 21279238303065874504, 325878859655043000344, 4765036384361599508980, 67005992305769489072298, 911373843678367079288192 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Alex V. Breger, Table of n, a(n) for n = 1..1000

V. Kotesovec, Non-attacking chess pieces

Vaclav Kotesovec, Generating function

FORMULA

Recurrence order is 548

CROSSREFS

Cf. A174558, A018807, A195653, A195658

Sequence in context: A187030 A237328 A186968 * A252919 A255779 A237206

Adjacent sequences:  A195645 A195646 A195647 * A195649 A195650 A195651

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Sep 22 2011

STATUS

approved

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Last modified August 19 07:13 EDT 2022. Contains 356216 sequences. (Running on oeis4.)