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A215872
Number of permutations of 0..floor((4*n-2)/2) on odd squares of an 4Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing
0
1, 1, 1, 4, 10, 78, 262, 3001, 11694, 170594, 727846, 12517074, 56797272, 1100044792, 5219906670, 110598847073, 542976951374, 12341741030502
OFFSET
1,4
COMMENTS
Row 4 of A215870
EXAMPLE
Some solutions for n=5
..x..0..x..2..x....x..0..x..2..x....x..0..x..2..x....x..0..x..2..x
..1..x..3..x..5....1..x..3..x..5....1..x..3..x..6....1..x..3..x..4
..x..4..x..6..x....x..4..x..7..x....x..4..x..7..x....x..5..x..7..x
..7..x..8..x..9....6..x..8..x..9....5..x..8..x..9....6..x..8..x..9
CROSSREFS
Sequence in context: A152397 A239502 A171754 * A371021 A059919 A143047
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 25 2012
STATUS
approved