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A267073 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west or southwest neighbor modulo 3 and the upper left element equal to 0. 2
2, 2, 6, 31, 141, 550, 2046, 8149, 34902, 152001, 652150, 2761689, 11707811, 50123854, 216480177, 938377955, 4069585995, 17658916102, 76776575711, 334729181549, 1462999055814, 6405806909581, 28085236208039, 123289001886325 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A267072.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..93

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A267072.

Sequence in context: A052584 A094303 A117394 * A003308 A180069 A032185

Adjacent sequences:  A267070 A267071 A267072 * A267074 A267075 A267076

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2016

STATUS

approved

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Last modified September 22 17:16 EDT 2020. Contains 337291 sequences. (Running on oeis4.)