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A298254
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Number of nX3 0..1 arrays with every element equal to 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.
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2
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0, 3, 1, 4, 3, 7, 14, 35, 89, 242, 643, 1713, 4584, 12341, 33393, 90828, 247775, 677335, 1853786, 5076655, 13907485, 38106762, 104424087, 286173877, 784293860, 2149515757, 5891305033, 16146865524, 44255648343, 121297428367, 332457355358
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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) +3*a(n-2) -7*a(n-3) -14*a(n-4) +2*a(n-5) +34*a(n-6) +16*a(n-7) -20*a(n-8) -48*a(n-9) -50*a(n-10) +36*a(n-11) +89*a(n-12) +39*a(n-13) +3*a(n-14) -9*a(n-15) -14*a(n-16) +2*a(n-18) for n>19
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EXAMPLE
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Some solutions for n=7
..0..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..1
..1..0..1. .0..0..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..1
..1..1..1. .1..0..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..1..0
..1..0..0. .1..1..0. .1..1..1. .0..0..0. .1..1..1. .1..1..1. .1..0..0
..0..1..0. .1..0..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1
..0..1..1. .0..0..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .1..0..1
..0..0..1. .0..1..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .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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