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A195648
Number of ways to place 9n nonattacking kings on a 18 x 2n chessboard.
4
5120, 1501674, 144605184, 7683664202, 282359109140, 8080813574550, 193194265398240, 4035559337688370, 75925129079783308, 1314578079936797520, 21279238303065874504, 325878859655043000344, 4765036384361599508980, 67005992305769489072298, 911373843678367079288192
OFFSET
1,1
FORMULA
Recurrence order is 548.
CROSSREFS
Column k=9 of A350819.
Sequence in context: A187030 A237328 A186968 * A252919 A255779 A237206
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Sep 22 2011
STATUS
approved