A266310 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west neighbor modulo 3 and the upper left element equal to 0.

2, 7, 39, 265, 1802, 12239, 84614, 597601, 4289844, 31138558, 227912351, 1679866698, 12457873439, 92883320659, 695746287346, 5232714491851, 39496475643074, 299071199295812, 2271081847307045, 17290623003826450

Offset: 1

Author

R. H. Hardin, Dec 26 2015

Keywords

• nonn

Comments

Row 3 of A266309.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..83

Crossrefs

Cf. A266309.