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A221479
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Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction
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1
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1, 73, 1407, 34751, 865318, 21576814, 538159483, 13422938865, 334800425933, 8350733876991, 208287552769998, 5195196692208296, 129580804689787280, 3232059523406689453, 80615402781266738787, 2010743650758352091582
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..1..2..1....1..2..0..0....0..3..0..0....0..2..0..0....0..2..0..1
..1..1..2..2....1..2..3..1....1..2..2..1....1..1..1..2....1..1..2..0
..0..1..1..0....0..0..1..1....1..0..2..0....2..1..2..0....1..1..2..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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