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A301321
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Number of nX6 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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32, 383, 735, 1709, 3649, 7600, 15802, 33150, 70311, 150532, 324443, 702447, 1525146, 3317041, 7221520, 15731216, 34280366, 74716439, 162869203, 355053284, 774048171, 1687544827, 3679181851, 8021454454, 17488766770, 38130129567
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OFFSET
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1,1
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COMMENTS
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Column 6 of A301323.
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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) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +2*a(n-7) -2*a(n-8) -3*a(n-9) +5*a(n-10) -a(n-11) -a(n-12) -a(n-14) +a(n-15) for n>19
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EXAMPLE
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Some solutions for n=5
..0..0..1..0..0..0. .0..1..0..1..1..1. .0..1..1..0..1..1. .0..1..0..0..0..0
..0..1..0..1..1..0. .1..0..1..0..0..0. .0..0..0..1..0..0. .0..0..1..1..1..1
..1..0..1..0..1..0. .1..0..1..1..1..0. .1..1..1..0..1..1. .1..1..0..0..0..0
..1..0..1..1..0..1. .1..0..0..0..1..0. .0..0..0..1..0..1. .0..0..1..1..1..1
..1..0..0..0..1..1. .1..1..1..0..1..1. .1..1..1..0..1..0. .1..1..0..0..0..0
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CROSSREFS
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Cf. A301323.
Sequence in context: A163690 A268999 A280602 * A300496 A300935 A300879
Adjacent sequences: A301318 A301319 A301320 * A301322 A301323 A301324
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 18 2018
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STATUS
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approved
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