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A298275
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Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
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1
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1, 18, 129, 873, 6013, 41437, 285280, 1964290, 13524686, 93121972, 641174645, 4414695072, 30396602133, 209290433195, 1441032289599, 9921973168730, 68315992804433, 470377695431660, 3238702495162085, 22299513676118700
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OFFSET
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1,2
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COMMENTS
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Column 3 of A298280.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 6*a(n-1) +8*a(n-2) -12*a(n-3) -8*a(n-4) +2*a(n-5) +3*a(n-6) -2*a(n-7) -7*a(n-9) +2*a(n-10) for n>11
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EXAMPLE
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Some solutions for n=6
..0..1..0. .0..0..0. .0..0..1. .0..0..1. .0..0..0. .0..1..1. .0..0..1
..0..1..0. .0..1..1. .0..1..1. .0..0..1. .1..1..0. .1..0..0. .1..1..0
..1..0..0. .1..0..0. .0..1..1. .0..1..1. .1..0..1. .1..0..0. .1..1..1
..0..1..0. .1..1..1. .1..0..0. .1..0..0. .0..1..0. .1..0..1. .1..0..0
..0..1..0. .0..1..0. .1..0..1. .0..1..0. .1..0..0. .1..1..0. .0..1..1
..0..1..1. .0..0..1. .1..1..0. .0..1..1. .0..1..1. .1..0..1. .0..0..1
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CROSSREFS
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Cf. A298280.
Sequence in context: A041620 A244879 A142965 * A299137 A299368 A299932
Adjacent sequences: A298272 A298273 A298274 * A298276 A298277 A298278
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 16 2018
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STATUS
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approved
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