A267164 Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.

2, 0, 1, 15, 65, 202, 537, 1559, 6506, 27557, 104122, 360598, 1236670, 4479897, 16998081, 64623235, 240399786, 880495525, 3233751496, 12035510317, 45240963675, 170207777737, 637838570111, 2384646622991, 8931032553574

Offset

1,1

Comments

Row 3 of A267163.

Links

R. H. Hardin, Table of n, a(n) for n = 1..89

Example

Some solutions for n=4
..0..2..1..1....0..2..1..0....0..0..2..2....0..0..2..1....0..2..2..1
..0..2..2..1....2..2..1..0....1..0..2..1....0..2..2..1....0..0..2..1
..0..0..2..1....2..1..1..0....1..0..2..1....0..2..1..1....1..0..2..1

Crossrefs

Cf. A267163.

Sequence in context: A322221 A328924 A217654 * A158234 A270882 A278778

Adjacent sequences: A267161 A267162 A267163 * A267165 A267166 A267167

Keyword

nonn

Author

R. H. Hardin, Jan 11 2016

Status

approved