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A203979
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Number of (n+1)X4 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order
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1
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96, 864, 7776, 69984, 629856, 5668704, 51018336, 459165024, 4132485216, 37192366944, 334731302496, 3012581722464, 27113235502176, 244019119519584, 2196172075676256, 19765548681086304, 177889938129776736
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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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FORMULA
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Empirical: a(n) = 96*9^(n-1)
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EXAMPLE
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Some solutions for n=4
..0..0..0..0....0..1..2..2....0..0..1..2....0..1..0..2....0..1..0..0
..1..2..2..1....2..1..0..0....2..2..1..0....2..2..0..1....2..2..2..1
..1..0..0..0....2..1..2..1....0..0..1..0....1..1..0..1....0..0..0..0
..1..2..2..1....0..0..2..0....2..2..2..2....2..2..2..1....1..1..1..1
..0..0..0..0....1..1..1..0....0..0..1..1....0..0..0..0....2..2..2..2
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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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