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A223116
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Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 22, 269, 5624, 64346, 1435644, 17231678, 394101698, 4795863215, 111385873044, 1367910381793, 32104125661092, 396732928643199, 9380176155748724, 116431632349956000, 2768141124993190440, 34474283501877795558
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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
..0..0..0....0..0..0....0..1..0....0..1..0....0..1..2....0..1..1....0..1..1
..1..0..2....0..1..2....1..2..0....0..2..0....0..1..2....1..1..0....2..1..2
..2..0..2....0..1..2....1..0..1....2..1..1....0..0..0....0..2..0....2..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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