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A265467
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Number of 2Xn 0..2+n-2 arrays with upper left zero and lower right 2+n-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.
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1
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1, 3, 26, 139, 765, 6221, 46898, 292690, 1722770, 10915890, 73213113, 480069015, 3032127834, 19084607287, 122424984026, 792495253960, 5097255978957, 32562226190102, 208268070296589, 1338186393004984, 8611472163134863
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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..1....0..1..3..1....0..2..1..2....0..1..2..0....0..2..1..3
..3..1..2..4....2..4..3..4....0..2..3..4....2..4..2..4....1..3..2..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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