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A207943
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Number of 7Xn 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically
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1
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14, 196, 826, 3641, 20568, 120276, 737575, 4570122, 28555126, 178852957, 1121957980, 7041891730, 44211129243, 277603005560, 1743182466528, 10946427636013, 68739662962482, 431662923010836, 2710711178183705
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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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FORMULA
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Empirical: a(n) = 11*a(n-1) -12*a(n-2) -210*a(n-3) +495*a(n-4) +1675*a(n-5) -4933*a(n-6) -7524*a(n-7) +24432*a(n-8) +22034*a(n-9) -69076*a(n-10) -45806*a(n-11) +114911*a(n-12) +67305*a(n-13) -109800*a(n-14) -63536*a(n-15) +56149*a(n-16) +33715*a(n-17) -13209*a(n-18) -8384*a(n-19) +1044*a(n-20) +720*a(n-21) for n>22
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EXAMPLE
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Some solutions for n=4
..1..0..1..1....0..1..0..1....1..0..1..1....0..0..0..0....0..0..0..0
..0..1..0..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..0..1
..1..0..1..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..0..1
..0..1..0..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..0..1
..0..1..1..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..0..1
..0..1..0..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..0..1
..0..1..0..1....1..0..1..0....0..1..1..1....1..0..1..0....0..1..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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