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A221871
Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction
1
0, 162, 2847, 109441, 2902629, 89325897, 2568285560, 75961646488, 2218174542607, 65123784146089, 1907357352061683, 55920523423826597, 1638742556637284630, 48032522511443152307, 1407738930106228011912, 41259605922847789338479
OFFSET
1,2
COMMENTS
Column 3 of A221873
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0....0..1..1....0..0..1....1..0..0....2..1..1....0..1..1....0..3..0
..1..2..4....1..1..3....1..3..3....1..3..1....0..2..1....2..3..0....1..1..1
..0..1..0....0..1..1....0..1..0....1..2..0....0..1..1....1..1..0....1..2..0
CROSSREFS
Sequence in context: A288489 A303413 A249295 * A245955 A128803 A035746
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 28 2013
STATUS
approved