A222840 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

2, 105, 4797, 326408, 15364848, 1077545438, 52487425596, 3689615795056, 182579365380505, 12856303224433084, 643621625467714042, 45333053732314073754, 2288743268254953421250, 161184278096856509113288

Offset: 1

Author

R. H. Hardin Mar 06 2013

Keywords

• nonn

Comments

Column 3 of A222842

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..64