A201211 Number of n X 3 0..3 arrays with every row and column running average nondecreasing rightwards and downwards.

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

R. H. Hardin, Table of n, a(n) for n = 1..51

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

Adjacent sequences: A201208 A201209 A201210 * A201212 A201213 A201214

Keyword

nonn

Author

R. H. Hardin, Nov 28 2011

Status

approved