Number of ways to place 9n nonattacking kings on an 18 X 2n cylindrical chessboard.

A195653

Number of ways to place 9n nonattacking kings on an 18 X 2n cylindrical chessboard.

Terms

    a(0) =5120a(1) =21508a(2) =109796a(3) =626780a(4) =3877300a(5) =25603228a(6) =178909300a(7) =1314748124a(8) =10105541204a(9) =80812754568a(10) =668845118276

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