A221932 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.

1, 1367, 153652, 20246283, 2568601026, 326363935235, 41397744561659, 5246761195398438, 664828879659318271, 84233175060135140710

Offset: 1

Author

R. H. Hardin Feb 01 2013

Keywords

• nonn

Comments

Row 4 of A221929

Examples

			Some solutions for n=3
..1..1..2....1..0..1....0..2..1....1..0..2....0..1..1....1..1..2....0..0..2
..0..0..1....1..1..1....0..1..2....2..0..1....0..1..1....0..0..1....0..6..0
..0..3..2....0..1..1....1..1..1....0..1..0....0..2..1....1..1..4....1..1..0
..0..2..0....1..3..1....0..1..2....1..2..2....2..2..1....0..1..0....0..1..1