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A220243
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Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX2 array
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1
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1, 5, 18, 37, 85, 184, 393, 826, 1726, 3568, 7342, 15009, 30562, 62034, 125493, 253311, 510438, 1026775, 2063029, 4141268, 8305979, 16649028, 33356608, 66803160, 133746856, 267712961, 535761706, 1072043156, 2144889675, 4291005857
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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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FORMULA
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Empirical: a(n) = 3*a(n-1) -a(n-2) +3*a(n-3) -14*a(n-4) +2*a(n-5) +3*a(n-6) +21*a(n-7) +6*a(n-8) -16*a(n-9) -12*a(n-10) -16*a(n-11) +12*a(n-12) +4*a(n-13) +8*a(n-14) for n>16
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EXAMPLE
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Some solutions for n=3
..0..1....1..1....1..1....0..1....1..0....1..1....1..0....1..0....0..0....0..1
..1..1....1..1....0..0....0..0....0..0....0..0....0..0....1..1....0..0....0..0
..0..0....1..1....0..0....0..0....0..1....1..1....0..0....0..0....1..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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