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A217342
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Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops
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1
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0, 38, 2389, 120908, 5756974, 267947653, 12350550690, 566789163488, 25958450760849, 1187754678765443, 54322924296499637, 2483989094275943631, 113572728843260660640, 5192525516036292143928, 237396286736491907178433
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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..0....0..0..1..0....0..0..2..1....1..2..2..1....1..2..2..1
..2..2..3..1....1..0..2..2....1..2..2..2....1..0..1..0....1..0..2..1
..0..0..1..0....1..2..2..1....0..1..0..1....1..1..2..0....0..0..2..0
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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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