A215874 Number of permutations of 0..floor((6*n-2)/2) on odd squares of an 6Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.
1, 1, 1, 8, 50, 1233, 15485, 767560, 14296434, 1124811332
Offset: 1
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Examples
Some solutions for n=4 ..x..0..x..2....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..2 ..1..x..3..x....2..x..3..x....2..x..3..x....2..x..3..x....1..x..3..x ..x..4..x..5....x..4..x..6....x..4..x..5....x..4..x..5....x..4..x..6 ..6..x..7..x....5..x..7..x....6..x..7..x....6..x..7..x....5..x..7..x ..x..8..x.10....x..8..x.10....x..8..x..9....x..8..x.10....x..8..x..9 ..9..x.11..x....9..x.11..x...10..x.11..x....9..x.11..x...10..x.11..x
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