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A224051 Number of n X n 0..2 arrays with rows and columns unimodal and antidiagonals nondecreasing 0
3, 54, 1232, 27246, 568107, 11231300, 212819499, 3903149379, 69818587635, 1225169731998 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A224057

LINKS

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

EXAMPLE

Some solutions for n=3

..2..1..1....0..1..0....0..0..0....2..1..0....1..1..0....2..0..0....0..0..0

..2..1..1....1..1..1....2..2..0....2..0..0....1..2..0....2..1..1....0..0..2

..1..2..1....1..1..0....2..2..2....0..0..0....2..2..1....2..2..1....1..2..0

CROSSREFS

Sequence in context: A223926 A003776 A222203 * A355365 A317663 A323325

Adjacent sequences: A224048 A224049 A224050 * A224052 A224053 A224054

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

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Last modified February 4 03:47 EST 2023. Contains 360045 sequences. (Running on oeis4.)