A266879 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.

1, 1, 2, 5, 11, 26, 46, 121, 400, 1109, 2924, 7992, 21954, 61748, 176647, 499953, 1409763, 3999662, 11391787, 32574599, 93459472, 268336008, 771070141, 2219952038, 6403510479, 18502345738, 53538515560, 155090741042, 449731074132

Offset

1,3

Comments

Row 3 of A266878.

Links

R. H. Hardin, Table of n, a(n) for n = 1..104

Example

All solutions for n=4
..0..2..2..1....0..2..1..0....0..0..2..1....0..2..1..1....0..1..2..0
..0..2..1..1....2..2..1..0....0..2..2..1....0..2..1..0....2..0..1..2
..0..2..1..0....2..1..1..0....0..2..1..1....2..2..1..0....1..2..0..1

Crossrefs

Cf. A266878.

Sequence in context: A001432 A127075 A053429 * A104237 A085945 A365322

Adjacent sequences: A266876 A266877 A266878 * A266880 A266881 A266882

Keyword

nonn

Author

R. H. Hardin, Jan 05 2016

Status

approved