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A229771
Number of n X n 0..3 arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order
1
4, 60, 3232, 1058494, 3062815568, 90462380211862, 29201160476766771330, 108134253835820664368578112
OFFSET
1,1
COMMENTS
Column 3 of A229774
EXAMPLE
Some solutions for n=3
..1..1..0....2..1..1....1..1..0....1..0..0....2..1..0....1..0..0....1..1..0
..1..1..1....3..3..0....1..1..2....1..1..1....3..0..2....2..1..0....2..1..0
..1..1..1....3..3..1....3..2..0....2..3..0....3..0..3....3..1..2....2..1..2
CROSSREFS
Sequence in context: A177780 A012567 A132627 * A341275 A338550 A340937
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 29 2013
STATUS
approved