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A195653
Number of ways to place 9n nonattacking kings on an 18 X 2n cylindrical chessboard.
6
5120, 21508, 109796, 626780, 3877300, 25603228, 178909300, 1314748124, 10105541204, 80812754568, 668845118276, 5700499630916, 49800720887968, 444140848321356, 4029482453905756, 37080781799409148, 345278411878468044, 3246772078088155432, 30781946900321278256
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 = 18, number of rows = 2n).
LINKS
FORMULA
Recurrence order is 400.
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Sep 22 2011
STATUS
approved