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

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

Crossrefs

Cf. A266318.

Sequence in context: A281949 A162551 A073663 * A155116 A133915 A370539

Adjacent sequences: A266316 A266317 A266318 * A266320 A266321 A266322

Keyword

nonn

Author

R. H. Hardin, Dec 27 2015

Status

approved