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A181199 Number of 5 X n matrices containing a permutation of 1..5*n in increasing order rowwise, columnwise, diagonally and (downwards) antidiagonally. 2
1, 1, 16, 985, 141696, 36372976, 14083834704, 7372392431849, 4848332563899256, 3808369342900073856, 3447336241467721584256, 3503140094024746011745456, 3918646197894288330216058576, 4753102567048482059557067412816, 6178133154985813161258658378449616 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 5 of A181196.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..26

EXAMPLE

Some solutions for 5 X 4:

..1..2..3..4....1..2..3..4....1..2..3..4....1..2..3..4....1..2..3..4

..5..6..7..8....5..6..7..8....5..6..7..8....5..6..7..8....5..6..7..8

..9.10.11.12....9.10.11.12....9.10.11.12....9.10.11.12....9.10.11.12

.13.14.15.16...13.14.15.17...13.14.15.18...13.14.16.17...13.14.16.18

.17.18.19.20...16.18.19.20...16.17.19.20...15.18.19.20...15.17.19.20

CROSSREFS

Cf. A181196.

Sequence in context: A264640 A211086 A187802 * A024301 A211090 A160012

Adjacent sequences:  A181196 A181197 A181198 * A181200 A181201 A181202

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 10 2010

EXTENSIONS

a(11)-a(26) from Alois P. Heinz, Jul 24 2012

STATUS

approved

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Last modified May 15 10:54 EDT 2021. Contains 343909 sequences. (Running on oeis4.)