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A215872 Number of permutations of 0..floor((4*n-2)/2) on odd squares of an 4Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing 0
1, 1, 1, 4, 10, 78, 262, 3001, 11694, 170594, 727846, 12517074, 56797272, 1100044792, 5219906670, 110598847073, 542976951374, 12341741030502 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 4 of A215870

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for n=5

..x..0..x..2..x....x..0..x..2..x....x..0..x..2..x....x..0..x..2..x

..1..x..3..x..5....1..x..3..x..5....1..x..3..x..6....1..x..3..x..4

..x..4..x..6..x....x..4..x..7..x....x..4..x..7..x....x..5..x..7..x

..7..x..8..x..9....6..x..8..x..9....5..x..8..x..9....6..x..8..x..9

CROSSREFS

Sequence in context: A152397 A239502 A171754 * A059919 A143047 A156329

Adjacent sequences:  A215869 A215870 A215871 * A215873 A215874 A215875

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 25 2012

STATUS

approved

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Last modified June 25 04:52 EDT 2021. Contains 345452 sequences. (Running on oeis4.)