A223912 - OEIS

A223912

Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.

3, 36, 666, 14123, 319156, 7526024, 183720802, 4620831232, 119279565646, 3149193338709, 84781194626719, 2321280055370071, 64493788929080253, 1814933493902398900, 51651065174273533812

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OFFSET

1,1

COMMENTS

Diagonal of A223918.

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A223918.

Sequence in context: A203493 A296098 A224256 * A224184 A241996 A366004

Adjacent sequences: A223909 A223910 A223911 * A223913 A223914 A223915

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2013

STATUS

approved