A222902 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

4, 25, 373, 7794, 180203, 4320431, 105327353, 2592612272, 64243363904, 1600125512239, 40022606753953, 1004596097977296, 25292398905119297, 638445931307999125, 16152880969313405490, 409495374971029069517

Offset: 1

Author

R. H. Hardin Mar 09 2013

Keywords

• nonn

Comments

Column 4 of A222906

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..136