A221690 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction

13, 1336, 95076, 7033429, 520770016, 38558774282, 2854945130275, 211383822013331, 15651127479431664, 1158829375610866111, 85801199678309146886, 6352829859620504245102, 470371595862197876296617

Offset

1,1

Comments

Column 4 of A221693

Links

R. H. Hardin, Table of n, a(n) for n = 1..78

Example

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

Crossrefs

Sequence in context: A091781 A156641 A300592 * A197630 A222017 A238562

Adjacent sequences: A221687 A221688 A221689 * A221691 A221692 A221693

Keyword

nonn

Author

R. H. Hardin Jan 22 2013

Status

approved