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A300309
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Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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4, 13, 20, 45, 148, 529, 1747, 5797, 19584, 66222, 223320, 753486, 2543959, 8589093, 28995289, 97886648, 330471005, 1115681398, 3766562359, 12716019134, 42929679141, 144931880115, 489294288989, 1651872133532, 5576769838008
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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) -6*a(n-2) +6*a(n-3) -16*a(n-4) +3*a(n-5) -3*a(n-6) +41*a(n-7) -21*a(n-9) +14*a(n-10) -66*a(n-11) +43*a(n-12) -46*a(n-13) +41*a(n-14) -8*a(n-15) +20*a(n-16) for n>17
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..0..0. .0..0..1. .0..0..1. .0..1..0. .0..1..0. .0..1..0
..1..1..1. .0..1..0. .1..0..1. .0..1..1. .0..0..1. .1..0..0. .0..1..1
..0..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .1..0..0. .0..1..1
..0..1..1. .1..1..1. .0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..1..0
..1..0..1. .0..0..0. .0..1..0. .1..0..1. .0..1..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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