|
| |
|
|
A195654
|
|
Number of ways to place 10n nonattacking kings on a 20 X 2n cylindrical chessboard
|
|
5
|
|
|
|
11264, 48132, 251126, 1473764, 9434784, 64923594, 476033636, 3694894500, 30179587994, 257860425672, 2290966142762, 21042965606234, 198765197377402, 1921681775292272, 18940490557328616, 189679152583318596, 1924757095250611458, 19746535064318923758
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
This cylinder is horizontal: a chessboard where it is supposed that the 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
|
|
|
FORMULA
|
Recurrence order is 916
|
|
|
CROSSREFS
|
Cf. A137432, A195653, A195649, A195659
Sequence in context: A051520 A051346 A217125 * A195649 A110375 A177216
Adjacent sequences: A195651 A195652 A195653 * A195655 A195656 A195657
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Vaclav Kotesovec, Sep 22 2011
|
|
|
STATUS
|
approved
|
| |
|
|
