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A301961
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Number of nX5 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 14, 41, 111, 311, 874, 2454, 6906, 19427, 54659, 153785, 432694, 1217420, 3425350, 9637573, 27116351, 76294719, 214663346, 603978142, 1699356882, 4781321499, 13452757355, 37850765441, 106497159950, 299641101508, 843072151982
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OFFSET
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1,1
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COMMENTS
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Column 5 of A301964.
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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) = 2*a(n-1) +3*a(n-2) -a(n-3) -2*a(n-4) -3*a(n-5) +2*a(n-6) for n>8
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EXAMPLE
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Some solutions for n=5
..0..1..0..0..1. .0..0..1..1..0. .0..0..1..0..0. .0..0..1..0..1
..0..1..1..0..1. .1..0..0..1..1. .1..0..1..1..0. .1..0..1..0..1
..0..0..1..0..1. .1..1..0..0..1. .1..0..0..1..1. .1..0..0..0..1
..1..0..1..0..1. .0..1..1..0..1. .1..1..0..0..1. .1..0..1..0..1
..1..0..1..0..1. .0..0..1..0..0. .0..1..1..0..0. .1..0..1..0..1
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CROSSREFS
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Cf. A301964.
Sequence in context: A144840 A257709 A121866 * A250478 A059676 A242198
Adjacent sequences: A301958 A301959 A301960 * A301962 A301963 A301964
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 29 2018
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STATUS
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approved
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