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A267164

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

2, 0, 1, 15, 65, 202, 537, 1559, 6506, 27557, 104122, 360598, 1236670, 4479897, 16998081, 64623235, 240399786, 880495525, 3233751496, 12035510317, 45240963675, 170207777737, 637838570111, 2384646622991, 8931032553574

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

OFFSET

1,1

COMMENTS

Row 3 of A267163.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..89

EXAMPLE

Some solutions for n=4

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

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

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