Number of ways to place 9n nonattacking kings on a vertical cylinder 18 X 2n.

A195658

Number of ways to place 9n nonattacking kings on a vertical cylinder 18 X 2n.

Terms

    a(0) =1024a(1) =50922a(2) =815816a(3) =7238864a(4) =44693472a(5) =216134044a(6) =877751236a(7) =3130270224a(8) =10105541204a(9) =30179587994a(10) =84719304384a(11) =226268016376a(12) =580363147336

External references