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A301320
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Number of nX5 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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16, 138, 293, 726, 1649, 3649, 8035, 17751, 39436, 88008, 197077, 442264, 993792, 2234792, 5027626, 11313294, 25460611, 57302948, 128973323, 290288905, 653378578, 1470622946, 3310082320, 7450351492, 16769302128, 37744471436
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OFFSET
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1,1
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COMMENTS
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Column 5 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) = 4*a(n-1) -3*a(n-2) -4*a(n-3) +4*a(n-4) +2*a(n-6) -5*a(n-8) +2*a(n-9) +4*a(n-10) -2*a(n-11) -2*a(n-12) +a(n-14) for n>16
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EXAMPLE
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Some solutions for n=5
..0..0..1..1..1. .0..1..0..1..1. .0..0..0..1..1. .0..1..0..0..0
..1..0..0..0..0. .0..0..1..0..0. .1..1..0..0..1. .1..0..1..1..1
..1..1..1..1..0. .1..1..0..1..1. .0..1..1..0..1. .1..0..0..0..1
..0..0..0..1..1. .0..0..1..0..0. .0..0..1..0..1. .1..1..1..0..1
..1..1..0..0..1. .1..1..0..1..1. .1..0..1..0..0. .0..0..1..0..1
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CROSSREFS
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Cf. A301323.
Sequence in context: A351698 A114182 A280601 * A300495 A300934 A300878
Adjacent sequences: A301317 A301318 A301319 * A301321 A301322 A301323
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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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