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A202134
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T(n,k) = Number of zero-sum n X k -3..3 arrays with every element equal to at least one horizontal or vertical neighbor.
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5
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0, 1, 1, 1, 13, 1, 7, 123, 123, 7, 5, 1205, 1857, 1205, 5, 43, 12287, 135315, 135315, 12287, 43, 43, 135179, 3767643, 22197147, 3767643, 135179, 43, 275, 1493247, 227460779, 3628653641, 3628653641, 227460779, 1493247, 275, 371, 16814401
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OFFSET
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1,5
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COMMENTS
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Table starts
...0.......1.........1..........7..........5........43.........43......275.371
...1......13.......123.......1205......12287....135179....1493247.16814401
...1.....123......1857.....135315....3767643.227460779.8550543057
...7....1205....135315...22197147.3628653641
...5...12287...3767643.3628653641
..43..135179.227460779
..43.1493247
.275
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LINKS
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EXAMPLE
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Some solutions for n=3, k=3
.-1..2..2....0..0..0....2..2.-2...-3.-3.-3....2..0..0....2.-2..2....1.-3.-3
.-1..2..2....0.-3..3....0..1.-2....3..3..3....2..0..0....2.-2..2....1..1.-3
.-2.-2.-2....0.-3..3....0..1.-2....0..0..0....2.-3.-3...-3.-3..2....2..2..2
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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