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A186485
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Number of (n+1) X (n+1) 0..5 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.
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1
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1296, 1638, 49225, 187120, 2297416, 7285701, 85779021, 302363961, 3344266701, 12548833941, 129972246981, 515938724421, 5061186988761, 21139419297501, 197573066244141, 863365403630181, 7729201644744621, 35162376035723961
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 3 X 3:
..0..3..2....4..2..0....5..3..0....3..3..0....3..5..0....0..0..5....3..0..0
..0..0..3....3..0..2....1..0..3....1..0..3....5..0..5....0..0..0....4..0..0
..0..0..0....0..3..0....0..1..5....0..1..2....0..5..3....0..0..0....0..4..4
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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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