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A221668
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Sum of neighbor maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 3Xn array
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1
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8, 48, 512, 3772, 31744, 262144, 2097152, 16728064, 134140928, 1073741824, 8587837440, 68719476736, 549755813888, 4397939335680, 35184372088832, 281474976710656, 2251796592459776, 18014398509481984, 144115185909972992
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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..0....1..1..0....1..1..1....1..0..0....1..0..1....1..1..1....1..0..0
..0..1..0....1..1..1....1..0..1....0..1..0....0..1..1....1..0..1....0..1..1
..0..1..1....1..1..0....1..1..1....1..0..0....0..0..1....1..0..1....0..0..0
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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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