A267224 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its west, northeast or southeast neighbor modulo 4 and the upper left element equal to 0.

6, 35, 458, 7137, 127262, 2409733, 47615756, 971807573, 20350582884, 435153995835, 9465755318980, 208865043851697, 4664235238647148, 105225575250055043, 2394702914722332876, 54911344462256296581

Offset

1,1

Comments

Row 4 of A267222.

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=4
..0..3..3..2....0..2..2..1....0..2..1..3....0..2..1..1....0..3..2..2
..2..2..0..3....1..1..0..3....2..0..3..3....0..0..3..3....1..1..0..0
..1..0..2..1....0..3..2..1....0..2..1..1....2..2..1..3....1..3..2..0
..3..1..1..0....2..0..3..3....2..0..3..1....2..0..3..1....3..1..3..2

Crossrefs

Cf. A267222.

Sequence in context: A268139 A361241 A051337 * A192996 A192997 A152128

Adjacent sequences: A267221 A267222 A267223 * A267225 A267226 A267227

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved