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A201799
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Number of zero-sum nX4 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors
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0
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85, 3617, 48335, 988589, 20960485, 472565771, 10857153407, 253641348337, 5979418257253, 142075597768273, 3395164032578079, 81529069984570623, 1965470518289395959
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OFFSET
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1,1
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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..1..0...-2..1..1..0...-2.-2.-1.-1...-1..1.-2..1...-1..2.-2.-2
..0.-1..1..1...-2..1..1..1....2..2..0..0....1..1.-2..1....2..2..0..0
..0.-1..1.-1...-2..1..0..0...-1..2..0..1....0..0.-2..2...-2..0..0..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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