A266456 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north neighbor modulo 3 and the upper left element equal to 0.

1, 5, 39, 357, 3471, 35003, 362265, 3821877, 40918431, 443234475, 4847042025, 53425329675, 592800026625, 6615155585925, 74183656771239, 835491101084757, 9445356930180735, 107140324945955483, 1218962144543118009

Offset

1,2

Comments

Row 3 of A266455.

Links

R. H. Hardin, Table of n, a(n) for n = 1..93

Example

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

Crossrefs

Cf. A266455.

Sequence in context: A115187 A388534 A378919 * A365765 A247772 A129763

Adjacent sequences: A266453 A266454 A266455 * A266457 A266458 A266459

Keyword

nonn

Author

R. H. Hardin, Dec 29 2015

Status

approved