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

Author

R. H. Hardin, Dec 29 2015

Keywords

• nonn

Comments

Row 3 of A266455.

Examples

			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
		

Links

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

Crossrefs

Cf. A266455.