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A223614 Number of n X n 0..1 arrays with rows and columns unimodal 0
2, 16, 240, 4466, 89630, 1856100, 39162020, 840122330, 18350758538, 409124396540, 9333564282142, 218396645933584, 5252293916506694 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223620

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

..1..1..0..0....0..1..0..0....0..0..0..0....1..0..0..0....0..1..1..0

..1..1..0..0....1..1..0..0....0..1..0..0....1..1..0..0....0..1..1..0

..1..1..0..0....0..1..0..0....0..1..1..0....1..1..1..1....0..1..1..0

..0..0..0..1....0..0..1..1....0..1..1..0....1..1..1..0....0..1..1..1

CROSSREFS

Sequence in context: A181218 A301581 A280394 * A152029 A152069 A188767

Adjacent sequences:  A223611 A223612 A223613 * A223615 A223616 A223617

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved

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Last modified January 22 07:39 EST 2020. Contains 331139 sequences. (Running on oeis4.)