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A201211
Number of n X 3 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.
1
23, 216, 1684, 11932, 79739, 512681, 3216277, 19817136, 120478844, 724707450, 4322688971, 25608764387, 150879112600, 884928308606, 5170909446013, 30121160018287, 174998088275471, 1014425257507861, 5869059549460367
OFFSET
1,1
COMMENTS
Column 3 of A201216.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..0....0..0..1....0..0..0....0..1..1....0..0..0....0..0..0....0..0..1
..0..0..0....0..2..2....1..2..2....0..3..2....0..2..3....0..0..1....1..1..3
..0..1..1....0..3..2....1..1..1....1..3..3....1..1..2....0..0..2....2..2..2
..0..2..3....2..3..3....1..3..3....2..3..3....1..1..3....1..2..2....2..3..3
..0..2..2....1..2..3....1..2..2....1..3..3....1..2..2....1..3..2....3..3..3
CROSSREFS
Cf. A201216.
Sequence in context: A112747 A201831 A027481 * A194783 A254870 A110028
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2011
STATUS
approved