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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
1
6, 326, 11878, 449069, 16834526, 632170065, 23731120064, 890904857988, 33445557232807, 1255586659165355, 47136215887025325, 1769549765701234779, 66431007429900317322, 2493899211740460190981, 93623949326949457663958
OFFSET
1,1
COMMENTS
Column 3 of A221886
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 30 2013
STATUS
approved