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A220330
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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..1 3Xn array
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1
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1, 12, 92, 572, 4062, 29467, 213225, 1540686, 11163495, 80656708, 581473349, 4190483128, 30199355040, 217538559602, 1566825952174, 11283025994195, 81236036737903, 584831754731217, 4210022381269251, 30304818855812080
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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..0....0..0..0....0..0..0....0..1..1....0..1..0....0..1..0....0..0..0
..0..1..0....1..0..1....1..1..0....0..1..0....0..1..1....1..1..0....0..0..1
..0..0..0....1..1..0....0..1..0....1..1..0....0..0..0....0..1..0....0..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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