A266319 - OEIS

A266319

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

1, 2, 8, 30, 114, 414, 1561, 6227, 25712, 107071, 445688, 1860037, 7822241, 33194789, 141813340, 608193866, 2615140082, 11275208902, 48764348038, 211550067336, 920159818053, 4010884160844, 17515357388423, 76622591861147

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

OFFSET

1,2

COMMENTS

Row 3 of A266318.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..100

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

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

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