A222873 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

2, 122, 6282, 443510, 23794078, 1698174722, 93656293632, 6637413406814, 372075279639542, 26219034320665058, 1485998820062892388, 104217650825897197592, 5955892893018468638926, 416011416350266218862952

Offset: 1

Author

R. H. Hardin Mar 08 2013

Keywords

• nonn

Comments

Column 3 of A222878

Examples

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

Links

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