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A203333
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Number of nX3 0..5 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
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1
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1, 36, 1311, 27056, 532547, 12872510, 327579980, 8009744714, 193577903773, 4737630434523, 116753918774537, 2874720279855525, 70727573042967301, 1741732763961365190, 42927969047213245402, 1058288844307696250301
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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
..2..4..4....4..4..2....5..5..1....2..2..2....5..5..0....2..3..3....1..1..1
..3..5..5....4..4..2....5..5..1....2..1..2....5..5..3....5..5..4....2..2..1
..5..5..5....1..5..5....3..3..1....5..5..4....3..5..5....5..5..4....2..3..3
..5..5..1....0..5..5....0..1..1....5..5..4....0..5..5....1..4..4....0..3..3
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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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