A269506 Number of 2Xn arrays containing n copies of 0..2-1 avoiding the pattern down-up in every row and column.

2, 6, 14, 34, 92, 258, 722, 2022, 5706, 16232, 46442, 133418, 384550, 1111614, 3221582, 9357450, 27233148, 79394646, 231822854, 677835636, 1984435484, 5816254262, 17064740572, 50114985298, 147303657830, 433319078074

Offset: 1

Author

R. H. Hardin, Feb 28 2016

Keywords

• nonn

Comments

Row 2 of A269505.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A269505.