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A266833 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or northwest neighbor modulo 3 and the upper left element equal to 0. 2
1, 1, 2, 5, 18, 64, 200, 608, 1892, 6003, 19569, 64801, 214944, 712344, 2360429, 7831744, 26066842, 87077489, 291778301, 979938877, 3296756218, 11106812985, 37470837895, 126595907915, 428321817846, 1451164032530, 4922769173389 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 3 of A266832.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..94

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A266832.

Sequence in context: A148427 A068000 A148428 * A148429 A093635 A024025

Adjacent sequences:  A266830 A266831 A266832 * A266834 A266835 A266836

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2016

STATUS

approved

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Last modified August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)