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A223817
Number of 3Xn 0..2 arrays with row sums nondecreasing and column sums unimodal
1
10, 222, 4120, 65465, 921010, 11789302, 139965348, 1562685952, 16583874090, 168662333466, 1654400665258, 15732261029037, 145639935220714, 1317015705919726, 11667008847929888, 101490035584201884
OFFSET
1,1
COMMENTS
Row 3 of A223815
LINKS
EXAMPLE
Some solutions for n=3
..2..1..0....1..1..0....0..2..1....1..2..0....0..1..1....0..0..0....0..2..1
..2..0..2....2..1..2....0..1..2....1..2..0....1..2..0....2..1..0....0..2..1
..1..2..1....2..2..2....2..0..2....1..1..2....1..2..1....2..1..2....0..2..2
CROSSREFS
Sequence in context: A199748 A210137 A064333 * A317171 A229256 A342601
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2013
STATUS
approved