A195649 Number of ways to place 10n nonattacking kings on a 20 x 2n chessboard.

11264, 5266069, 714611200, 50123713793, 2335042206624, 82425144219429, 2383116363555182, 59315924213143597, 1314578079936797520, 26568150968269086211, 498306336520679626558, 8788579757709800395287, 147246060712874767006100, 2362334876238883501403023

Offset

1,1

Links

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

Vaclav Kotesovec, Non-attacking chess pieces

Vaclav Kotesovec, Generating function

Formula

Recurrence order is 1318.

Crossrefs

Column k=10 of A350819.

Cf. A018807, A195654, A195659.

Sequence in context: A051346 A217125 A195654 * A110375 A252859 A177216

Adjacent sequences: A195646 A195647 A195648 * A195650 A195651 A195652

Keyword

nonn

Author

Vaclav Kotesovec, Sep 22 2011

Status

approved