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A215792 Number of permutations of 0..floor((6*n-1)/2) on even squares of an 6*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing 0
1, 1, 1, 4, 50, 458, 15485, 234217, 14296434, 297246092, 26970790176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 6 of A215788

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

..0..x..1..x..4....0..x..1..x..2....0..x..1..x..4....0..x..1..x..2

..x..2..x..5..x....x..3..x..4..x....x..2..x..5..x....x..3..x..4..x

..3..x..6..x..8....5..x..6..x..7....3..x..6..x..8....5..x..6..x..8

..x..7..x.10..x....x..8..x..9..x....x..7..x..9..x....x..7..x..9..x

..9..x.11..x.13...10..x.11..x.13...10..x.11..x.13...10..x.11..x.12

..x.12..x.14..x....x.12..x.14..x....x.12..x.14..x....x.13..x.14..x

CROSSREFS

Sequence in context: A231833 A028455 A232731 * A280358 A114480 A123356

Adjacent sequences:  A215789 A215790 A215791 * A215793 A215794 A215795

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 23 2012

STATUS

approved

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Last modified July 13 04:53 EDT 2020. Contains 335673 sequences. (Running on oeis4.)