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A221291
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Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 3Xn array
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0
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1, 12, 92, 673, 5912, 48298, 396846, 3240527, 26241353, 211785583, 1703772887, 13679840407, 109689414233, 878752161168, 7035829547262, 56311795445487
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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..1..1....0..0..0....0..0..0....0..1..0....0..0..1....0..1..0....0..0..0
..0..1..0....1..1..0....0..1..0....0..0..1....0..1..0....0..0..0....0..0..1
..0..0..0....0..1..0....0..1..0....0..1..0....0..0..0....0..1..0....1..1..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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