A221884 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction

6, 326, 11878, 449069, 16834526, 632170065, 23731120064, 890904857988, 33445557232807, 1255586659165355, 47136215887025325, 1769549765701234779, 66431007429900317322, 2493899211740460190981, 93623949326949457663958

Offset

1,1

Comments

Column 3 of A221886

Links

R. H. Hardin, Table of n, a(n) for n = 1..66

Example

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

Crossrefs

Sequence in context: A204462 A135397 A042421 * A003742 A324099 A135195

Adjacent sequences: A221881 A221882 A221883 * A221885 A221886 A221887

Keyword

nonn

Author

R. H. Hardin Jan 30 2013

Status

approved