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A208315
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Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.
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1
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1, 13, 2852, 5269968, 82063614224, 10768439015566880, 11907389879137262727680, 110953732239793838864921644288, 8712219181636799263542546576017159296, 5764706550248813633923105729304227646191895040
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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=4
..0..1..0..2....0..0..0..1....0..1..2..1....0..0..1..1....0..0..0..1
..1..2..2..1....2..1..0..2....2..2..1..2....2..1..0..1....2..0..1..0
..1..0..1..1....2..0..0..2....0..2..2..2....1..2..2..2....0..2..1..1
..0..0..2..0....1..0..1..2....0..0..2..1....1..0..0..0....2..0..0..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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