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A299656
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Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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4, 32, 227, 1642, 11888, 86123, 624007, 4521433, 32761769, 237388544, 1720095182, 12463651182, 90310472508, 654381403622, 4741587670337, 34357109680119, 248948467884508, 1803857782078629, 13070588164990173, 94708283921766839
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OFFSET
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1,1
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COMMENTS
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Column 3 of A299661.
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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) = 7*a(n-1) +3*a(n-2) -6*a(n-3) -18*a(n-4) -15*a(n-5) -17*a(n-6) -32*a(n-7) -12*a(n-8)
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..1..0. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..1..1
..0..1..0. .0..1..1. .0..0..1. .0..1..1. .0..0..1. .0..0..1. .1..0..1
..1..1..0. .0..0..0. .1..0..0. .1..0..1. .0..1..1. .0..1..1. .0..1..1
..0..0..1. .0..0..1. .0..1..1. .0..0..1. .0..0..1. .1..1..1. .1..0..0
..0..0..1. .0..0..0. .0..0..1. .0..1..1. .1..0..0. .1..1..1. .0..1..1
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CROSSREFS
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Cf. A299661.
Sequence in context: A299735 A099269 A316810 * A125823 A320366 A317560
Adjacent sequences: A299653 A299654 A299655 * A299657 A299658 A299659
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Feb 15 2018
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STATUS
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approved
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