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A202981
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Number of n X n 0..2 arrays with every nonzero element less than or equal to some NW, E or S neighbor
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0
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1, 9, 1233, 595202, 2075667829, 54374200726981, 9811910575029966643, 12034608427204532840940835, 102201977619119405092991507364893, 6015924965468985859548914234181730364514
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OFFSET
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1,2
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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..2..2....0..1..2....1..0..0....2..2..2....2..1..0....1..1..0....0..2..0
..1..2..2....2..2..2....2..2..1....1..1..2....2..2..0....1..1..1....2..2..2
..1..1..1....2..2..2....0..2..2....1..1..1....0..0..2....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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