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 A215793 Number of permutations of 0..floor((7*n-1)/2) on even squares of an 7*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing 0
 1, 1, 1, 8, 125, 2988, 146205, 6812794, 673507749, 48337803306 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Row 7 of A215788 LINKS EXAMPLE Some solutions for n=4 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x ..x..2..x..4....x..2..x..3....x..2..x..3....x..2..x..4....x..2..x..4 ..3..x..5..x....4..x..5..x....4..x..5..x....3..x..5..x....3..x..5..x ..x..6..x..7....x..6..x..7....x..6..x..7....x..6..x..8....x..6..x..8 ..8..x..9..x....8..x..9..x....8..x..9..x....7..x..9..x....7..x..9..x ..x.10..x.12....x.10..x.12....x.10..x.11....x.10..x.12....x.10..x.11 .11..x.13..x...11..x.13..x...12..x.13..x...11..x.13..x...12..x.13..x CROSSREFS Sequence in context: A110272 A215040 A033536 * A273279 A227851 A076960 Adjacent sequences:  A215790 A215791 A215792 * A215794 A215795 A215796 KEYWORD nonn AUTHOR R. H. Hardin Aug 23 2012 STATUS approved

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Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)