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A281404
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Number of 5Xn 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
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1
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0, 160, 1413, 2886, 5892, 10130, 16241, 25680, 41353, 67226, 108849, 176500, 287083, 467706, 762549, 1242828, 2024499, 3295966, 5361623, 8713840, 14148393, 22950214, 37193019, 60220156, 97418383, 157461854, 254309175, 410409716, 661848005
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OFFSET
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1,2
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COMMENTS
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Row 5 of A281400.
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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) -6*a(n-2) +6*a(n-3) -7*a(n-4) +8*a(n-5) -9*a(n-6) +8*a(n-7) -5*a(n-8) +4*a(n-9) -3*a(n-10) +2*a(n-11) -a(n-12) for n>19
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EXAMPLE
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Some solutions for n=4
..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..0..0..1. .0..1..1..0
..0..1..0..0. .0..1..0..0. .0..1..0..0. .0..1..0..1. .1..0..1..0
..1..1..0..1. .0..1..1..1. .0..1..0..1. .0..1..0..1. .0..0..1..1
..0..0..0..1. .0..1..0..1. .1..1..1..0. .1..1..0..1. .1..1..0..0
..0..1..1..0. .0..1..0..0. .0..0..0..1. .1..0..0..0. .0..1..0..1
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CROSSREFS
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Cf. A281400.
Sequence in context: A236518 A120103 A235655 * A127409 A013447 A013446
Adjacent sequences: A281401 A281402 A281403 * A281405 A281406 A281407
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 21 2017
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STATUS
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approved
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