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A267223 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west, northeast or southeast neighbor modulo 3 and the upper left element equal to 0. 1
2, 3, 8, 17, 34, 68, 164, 385, 826, 1848, 4450, 10544, 24056, 56108, 135672, 324720, 762864, 1818110, 4413518, 10641004, 25427616, 61338160, 149415144, 362365684, 875207554, 2127235158, 5197934580, 12666448776, 30813494386, 75278796468 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A267222.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..154

EXAMPLE

Some solutions for n=4

..0..0..2..1....0..2..1..1....0..2..1..1....0..2..1..1....0..2..1..0

..2..1..0..2....2..1..0..2....1..0..0..2....2..1..0..2....1..0..2..1

..1..0..2..1....0..2..1..0....2..2..1..0....0..0..2..1....2..1..0..2

CROSSREFS

Cf. A267222.

Sequence in context: A210701 A158921 A064954 * A292401 A132333 A182889

Adjacent sequences:  A267220 A267221 A267222 * A267224 A267225 A267226

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2016

STATUS

approved

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Last modified September 16 07:19 EDT 2021. Contains 347469 sequences. (Running on oeis4.)