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A201798
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Number of zero-sum nX3 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors
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1
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19, 455, 4057, 48335, 562961, 7099021, 90062519, 1168520339, 15269686011, 201396758073, 2670595602167, 35597100656221, 476317522683397, 6395415423401799, 86112911010980123, 1162374111689802707
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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=4
.-2.-2.-2....1.-1..1....1..1.-2....0..1..1...-1..0..0....1..1.-2....1.-2..2
..2..2..2....0.-1..2...-2.-2..2....2..2..2....1..1..1....1..1.-2...-2.-2..2
.-1.-1.-1....0.-1..2....2.-2..2...-2.-2.-2....0..1..1...-1..1..1....2..2..2
..2.-1..2...-2.-1..0....2.-2..0...-1.-1..0....0.-2.-2...-1.-1..1...-2.-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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