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A192765
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Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 2 and with new values 0..2 introduced in lower triangular row major order
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1
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0, 0, 0, 73, 6486, 1127280, 455878230, 457521123971, 1154811828698984, 7352963503841306070, 118143132683839293396707, 4790379790527104234486857472, 490170667488489136298923882507851
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Some solutions for 4X4
..0..0..1..1....0..0..2..2....0..0..0..1....0..0..1..2....0..0..0..2
..0..0..2..1....0..1..1..2....0..0..1..1....0..0..1..2....0..0..1..2
..1..2..2..1....2..1..2..2....0..1..1..2....1..1..1..1....0..1..1..0
..1..1..1..1....2..2..2..2....1..1..2..2....2..2..1..1....2..2..0..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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