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A299670
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Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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2
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4, 26, 94, 372, 1512, 6133, 24742, 100035, 404608, 1636222, 6616385, 26756052, 108199516, 437548895, 1769407046, 7155326538, 28935512224, 117012660592, 473188897749, 1913534302589, 7738164499878, 31292456968931, 126543945261462
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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) = 5*a(n-1) -3*a(n-2) -12*a(n-4) -15*a(n-5) +20*a(n-6) +17*a(n-7) +32*a(n-8) -64*a(n-9) -5*a(n-10) +25*a(n-11) +77*a(n-12) +11*a(n-13) -27*a(n-14) -21*a(n-15) -14*a(n-16) -13*a(n-17) -4*a(n-18) for n>19
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EXAMPLE
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Some solutions for n=7
..0..1..1. .0..1..1. .0..1..1. .0..0..1. .0..0..0. .0..1..0. .0..0..1
..0..0..0. .0..1..1. .1..0..0. .1..1..0. .0..1..1. .1..0..0. .1..1..0
..1..0..0. .0..0..0. .1..1..1. .0..0..0. .1..1..0. .1..1..1. .1..1..1
..0..0..0. .1..0..0. .0..1..1. .0..0..1. .0..0..0. .0..1..1. .1..1..0
..0..1..1. .0..0..0. .1..1..1. .0..0..0. .0..0..1. .1..1..1. .1..1..1
..1..0..1. .0..1..1. .0..1..1. .0..0..1. .0..0..0. .1..0..0. .0..0..1
..0..1..0. .0..1..1. .0..1..1. .0..0..1. .1..1..0. .0..1..1. .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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