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A202044
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Number of zero-sum nX5 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors
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1
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51, 1593, 19541, 359017, 6221993, 119412837, 2229078023, 43322352587, 834780981463, 16419276700137, 322292535850539, 6395286541286533, 126942458619056105, 2535214795070175713, 50692230117983107173
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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
.-1..0..0..0..1...-1.-1..1.-1.-1....1..1..0..0..1...-1..1.-1.-1.-1
..1..1..1..0..0....1..1..1..0..0...-1.-1.-1..0..0...-1..1..1..1..1
.-1.-1..1.-1.-1....1..0..0..0.-1....1..1.-1..0.-1....1..1.-1.-1..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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