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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

Table of n, a(n) for n=1..10.

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.)