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A316415
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Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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4, 5, 14, 27, 66, 180, 484, 1261, 3346, 8912, 23666, 62840, 166959, 443676, 1178829, 3132091, 8322214, 22112722, 58754687, 156114566, 414806153, 1102165608, 2928521067, 7781259792, 20675285518, 54935502703, 145967000962, 387843280136
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OFFSET
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1,1
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COMMENTS
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Column 3 of A316420.
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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) = a(n-1) +3*a(n-2) +4*a(n-3) +2*a(n-4) -3*a(n-5) -9*a(n-6) -6*a(n-7) for n>10
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EXAMPLE
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Some solutions for n=5
..0..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0
..0..1..1. .1..0..0. .0..0..0. .1..0..0. .0..1..1. .0..0..0. .0..1..0
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .1..0..1
..0..0..0. .0..0..0. .1..0..1. .0..0..0. .0..0..0. .1..1..0. .1..1..1
..0..1..0. .0..1..0. .0..0..0. .0..0..0. .0..0..0. .1..1..0. .1..0..1
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CROSSREFS
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Cf. A316420.
Sequence in context: A200177 A241863 A350527 * A007084 A216243 A093862
Adjacent sequences: A316412 A316413 A316414 * A316416 A316417 A316418
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jul 02 2018
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STATUS
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approved
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