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A223993 Number of n X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing 0
3, 31, 476, 7927, 132119, 2160036, 34534687, 540957770, 8329684774, 126518474741, 1901584578700, 28359907789963, 420651674953990, 6217185029060841, 91703594406693983 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223999

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A126346 A142999 A212917 * A342206 A143637 A327227

Adjacent sequences:  A223990 A223991 A223992 * A223994 A223995 A223996

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

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Last modified March 6 20:37 EST 2021. Contains 341850 sequences. (Running on oeis4.)