A221885 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction

13, 3223, 449069, 65039658, 9356131846, 1347142288446, 193944559610138, 27922276785982528, 4019968490456852781, 578754876292668561410, 83323335396986744374226, 11996060075504536682447230

Offset

1,1

Comments

Column 4 of A221886

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A220642 A260982 A159357 * A134159 A221851 A221924

Adjacent sequences: A221882 A221883 A221884 * A221886 A221887 A221888

Keyword

nonn

Author

R. H. Hardin Jan 30 2013

Status

approved