A195654 Number of ways to place 10n nonattacking kings on a 20 X 2n cylindrical chessboard.

11264, 48132, 251126, 1473764, 9434784, 64923594, 476033636, 3694894500, 30179587994, 257860425672, 2290966142762, 21042965606234, 198765197377402, 1921681775292272, 18940490557328616, 189679152583318596, 1924757095250611458, 19746535064318923758

Offset

1,1

Comments

This cylinder is horizontal: a chessboard where it is supposed that rows 1 and 2n are in contact (number of columns = 20, number of rows = 2n).

Links

Alex V. Breger, Table of n, a(n) for n = 1..500

Artem M. Karavaev, Zealint blog (in Russian)

V. Kotesovec, Non-attacking chess pieces

Vaclav Kotesovec, Generating function

Index entries for linear recurrences with constant coefficients, order 916.

Formula

Recurrence order is 916.

Crossrefs

Cf. A137432, A195653, A195649, A195659.

Sequence in context: A051520 A051346 A217125 * A195649 A110375 A252859

Adjacent sequences: A195651 A195652 A195653 * A195655 A195656 A195657

Keyword

nonn

Author

Vaclav Kotesovec, Sep 22 2011

Status

approved