A222576 Number of 4Xn 0..2 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

14, 18, 120, 435, 3516, 25441, 212957, 1933819, 17971162, 172292518, 1649722196, 15907967878, 153952727468, 1485280127413, 14446587454682, 139301828808661, 1359137046700841

Offset: 1

Author

R. H. Hardin Feb 25 2013

Keywords

• nonn

Comments

Row 4 of A222573

Examples

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