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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. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 20 12:44 EDT 2020. Contains 337264 sequences. (Running on oeis4.)