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A231949
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Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero
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1
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4, 142, 14842, 6517534, 11501370840, 80362090509378, 2227569337736429246, 245123750599446294788488, 107075160540284607946778623864, 185664549157140167132223088015356148
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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 n=3
..0..1..1..1....0..0..0..0....0..1..1..0....0..1..1..0....0..1..1..1
..0..0..0..1....1..0..0..1....0..0..0..1....1..0..0..1....1..0..0..0
..1..1..1..0....0..1..0..1....1..1..1..1....1..1..0..1....0..1..1..0
..1..1..0..1....1..1..0..0....1..1..0..0....1..0..1..0....0..0..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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