A195655 Number of ways to place 11n nonattacking kings on a 22 X 2n cylindrical chessboard.

24576, 106500, 565512, 3392964, 22327496, 158877948, 1212120160, 9849731140, 84719304384, 766319864440, 7241521734020, 71028444904044, 718816489322444, 7466044767879028, 79230397598482712, 855840660674700612, 9381236750764316676, 104090420921618696952

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 = 22, 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

Max A. Alekseyev, Denominator of the generating function

Vaclav Kotesovec, Generating function

Formula

Recurrence order is 1829.

Crossrefs

Cf. A137432, A195653, A195654, A195650, A195660.

Sequence in context: A258441 A244150 A229798 * A203983 A188791 A195650

Adjacent sequences: A195652 A195653 A195654 * A195656 A195657 A195658

Keyword

nonn

Author

Vaclav Kotesovec, Sep 22 2011

Status

approved