A221202 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

0, 49, 46, 9025, 58700, 2518569, 32085376, 848789956, 14068757692, 311366232004, 5733258186854, 118412678934081, 2273843945394922, 45702294155340601, 892403786998151272, 17744284197389113081, 348794591561701410272

Offset: 1

Author

R. H. Hardin Jan 04 2013

Keywords

• nonn

Comments

Row 3 of A221200

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..30