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A224256 Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing 0
3, 36, 648, 12467, 238366, 4480391, 83124099, 1530419762, 28072690614, 514262753781, 9420094252771 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A224262

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A305991 A203493 A296098 * A223912 A224184 A241996

Adjacent sequences:  A224253 A224254 A224255 * A224257 A224258 A224259

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 02 2013

STATUS

approved

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Last modified November 17 18:24 EST 2019. Contains 329241 sequences. (Running on oeis4.)