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A221854
Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction
0
1, 306, 10085, 465305, 19159028, 811781250, 34109464173, 1436352539452, 60446151885851, 2544184795092968
OFFSET
1,2
COMMENTS
Row 3 of A221852
EXAMPLE
Some solutions for n=3
..2..1..1....0..1..0....0..0..1....2..1..0....1..1..3....1..0..0....1..0..2
..0..0..0....0..3..2....0..4..1....1..0..1....0..0..1....1..3..1....3..0..1
..3..1..1....0..3..0....0..1..2....1..3..0....0..2..1....2..1..0....0..2..0
CROSSREFS
Sequence in context: A172966 A223073 A064257 * A221724 A023908 A035843
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 27 2013
STATUS
approved