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 A215790 Number of permutations of 0..floor((4*n-1)/2) on even squares of an 4*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing 0
 1, 1, 1, 2, 10, 29, 262, 932, 11694, 46988, 727846, 3166688, 56797272, 261286670, 5219906670, 25024705056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Row 4 of A215788 LINKS EXAMPLE Some solutions for n=5 ..0..x..1..x..2....0..x..1..x..2....0..x..1..x..4....0..x..1..x..4 ..x..3..x..4..x....x..3..x..5..x....x..2..x..5..x....x..2..x..5..x ..5..x..6..x..8....4..x..6..x..7....3..x..6..x..8....3..x..6..x..7 ..x..7..x..9..x....x..8..x..9..x....x..7..x..9..x....x..8..x..9..x CROSSREFS Sequence in context: A047112 A190186 A032250 * A133485 A215954 A098425 Adjacent sequences:  A215787 A215788 A215789 * A215791 A215792 A215793 KEYWORD nonn AUTHOR R. H. Hardin Aug 23 2012 STATUS approved

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Last modified December 2 05:01 EST 2021. Contains 349437 sequences. (Running on oeis4.)