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.

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

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 A354420

Adjacent sequences: A266830 A266831 A266832 * A266834 A266835 A266836

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved