A195004 Number of ways to place 7n nonattacking kings on a 14 X 2n cylindrical chessboard.

1024, 4100, 19648, 103508, 580664, 3419648, 20984924, 133538996, 877751236, 5937279840, 41180193352, 291859775552, 2106967145904, 15448890481568, 114765555945488, 861942483797204, 6533144250310688, 49899718750389380, 383593821097441412, 2964842429047018248

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 = 14, number of rows = 2n).

Links

Table of n, a(n) for n=1..20.

V. Kotesovec, Number of ways of placing non-attacking queens, kings, bishops and knights

Vaclav Kotesovec, G.f., recurrence and explicit formula

Crossrefs

Cf. A174155, A194644, A194645, A194646, A194647, A194648, A137432, A195595.

Sequence in context: A257650 A255664 A358001 * A237370 A135289 A189071

Adjacent sequences: A195001 A195002 A195003 * A195005 A195006 A195007

Keyword

nonn

Author

Vaclav Kotesovec, Sep 07 2011

Status

approved