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A298128
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Number of nX3 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
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1
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0, 2, 4, 13, 62, 223, 826, 3200, 12098, 45921, 174562, 662609, 2516820, 9558976, 36301634, 137870761, 523613086, 1988599181, 7552421216, 28682975530, 108933718764, 413714339533, 1571226249932, 5967286725891, 22662879439242
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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) +4*a(n-2) -12*a(n-4) -7*a(n-5) -2*a(n-6) -13*a(n-7) +46*a(n-8) +28*a(n-9) -78*a(n-10) -23*a(n-11) +61*a(n-12) +14*a(n-13) -8*a(n-14) -2*a(n-15) -14*a(n-16) +4*a(n-18)
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EXAMPLE
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Some solutions for n=7
..0..1..1. .0..1..1. .0..0..1. .0..0..1. .0..0..0. .0..0..1. .0..0..1
..0..0..1. .0..0..1. .0..1..1. .0..1..1. .1..0..1. .0..1..1. .0..1..1
..0..0..1. .1..1..0. .0..1..0. .1..0..0. .1..1..1. .0..1..0. .1..0..1
..0..1..1. .1..0..0. .0..0..0. .1..1..0. .1..1..1. .1..0..0. .1..0..0
..0..1..1. .0..1..1. .1..1..1. .1..1..0. .1..0..1. .1..1..1. .0..1..1
..0..1..0. .0..1..1. .0..1..0. .0..1..0. .1..0..0. .0..0..1. .0..1..0
..0..0..0. .0..0..1. .0..0..0. .0..0..0. .1..1..0. .0..1..1. .0..0..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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