A209502 Number of nX7 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

855, 1920126, 5801378991, 17538444837670, 53052739133301878, 160472621147386212721, 485400266057664024464791, 1468244769479038501500597043, 4441166748603271019044231589770

Offset: 1

Author

R. H. Hardin Mar 09 2012

Keywords

• nonn

Comments

Column 7 of A209503

Examples

			Some solutions for n=4
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..1..0..1..2
..1..2..3..4..1..4..1....1..2..1..2..1..2..1....2..1..2..0..2..0..2
..4..1..2..4..3..3..3....0..0..2..3..1..3..1....3..1..3..3..0..1..0
..0..4..4..3..0..4..0....2..1..0..0..1..4..1....2..3..2..0..1..2..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..124