A266292 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northeast neighbor modulo 3 and the upper left element equal to 0.

1, 2, 5, 12, 33, 97, 278, 821, 2504, 7766, 24609, 79116, 256012, 833076, 2724322, 8948557, 29528100, 97848681, 325395649, 1085321033, 3629107776, 12162007737, 40841502890, 137415398075, 463180693482, 1563820191273, 5287901007259

Offset

1,2

Comments

Row 3 of A266291.

Links

R. H. Hardin, Table of n, a(n) for n = 1..109

Example

Some solutions for n=6
..0..2..2..1..1..0....0..0..2..1..1..0....0..0..2..2..2..1....0..2..2..1..1..1
..2..2..1..0..0..2....2..2..1..1..0..0....2..2..1..1..1..0....2..1..1..0..0..0
..1..1..0..0..2..1....2..1..1..0..2..2....2..1..1..0..0..0....1..0..0..2..2..2

Crossrefs

Cf. A266291.

Sequence in context: A281489 A225616 A186739 * A004114 A208957 A209051

Adjacent sequences: A266289 A266290 A266291 * A266293 A266294 A266295

Keyword

nonn

Author

R. H. Hardin, Dec 26 2015

Status

approved