A222826 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

2, 80, 2695, 163059, 4990235, 324288311, 10170499564, 674288738013, 21373928441126, 1435823246721009, 45884479727848365, 3108101397467123619, 99916343889082020272, 6807459787910922090689, 219837420324993531866814

Offset: 1

Author

R. H. Hardin Mar 06 2013

Keywords

• nonn

Comments

Column 3 of A222828

Examples

			Some solutions for n=3
..0..1..2....0..1..1....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..1..3..1....2..2..0....2..3..0....1..3..0....2..1..3....0..3..1....3..3..1
..2..1..3....0..3..2....0..3..0....2..0..1....3..0..1....2..3..0....0..2..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..68