A223038 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

2, 98, 3780, 255943, 10904199, 751990800, 33007705273, 2293741863398, 102466787449225, 7147587418650349, 323100169712798727, 22585791054054582654, 1029786157956416130280, 72077809347126994984977

Offset: 1

Author

R. H. Hardin Mar 12 2013

Keywords

• nonn

Comments

Column 3 of A223041

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..114