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A223912
Number of n X n 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.
0
3, 36, 666, 14123, 319156, 7526024, 183720802, 4620831232, 119279565646, 3149193338709, 84781194626719, 2321280055370071, 64493788929080253, 1814933493902398900, 51651065174273533812
OFFSET
1,1
COMMENTS
Diagonal of A223918.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 29 2013
STATUS
approved