A222584 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

4, 18, 112, 1087, 11442, 128213, 1471412, 17068476, 198654710, 2328829654, 27335961632, 322535055233, 3807753230632, 45124599083917, 535113331694641, 6363369440619695, 75729209656948170, 903078623804307816

Offset: 1

Author

R. H. Hardin Feb 25 2013

Keywords

• nonn

Comments

Column 4 of A222587

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..83