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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

Table of n, a(n) for n=1..16.

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.)