A221695 Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction

1, 144, 3112, 95076, 2627760, 74531185, 2098932856, 59210733473, 1669668324450, 47086135048676, 1327854674388881, 37446255355092156, 1056006037475086696, 29779973215497145163, 839812326958816104725, 23683188619380401285537

Offset

1,2

Comments

Row 3 of A221693

Links

R. H. Hardin, Table of n, a(n) for n = 1..69

Example

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

Crossrefs

Sequence in context: A264107 A231584 A367702 * A223323 A251433 A223300

Adjacent sequences: A221692 A221693 A221694 * A221696 A221697 A221698

Keyword

nonn

Author

R. H. Hardin Jan 22 2013

Status

approved