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A297015
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Number of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1s.
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1
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1, 3, 8, 14, 39, 135, 400, 1310, 4481, 15005, 50813, 173538, 590268, 2009778, 6857427, 23374979, 79672060, 271719009, 926494874, 3158768148, 10771237589, 36728205113, 125230802047, 427013571111, 1456037283696, 4964723542111
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = a(n-1) +5*a(n-2) +22*a(n-3) -3*a(n-4) -80*a(n-5) -161*a(n-6) -18*a(n-7) +288*a(n-8) +466*a(n-9) +118*a(n-10) -275*a(n-11) -312*a(n-12) +63*a(n-13) +36*a(n-14) -124*a(n-15) -134*a(n-16) +22*a(n-17) +68*a(n-18) -17*a(n-19) -20*a(n-20)
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EXAMPLE
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Some solutions for n=7
..0..1..1. .1..1..0. .0..0..0. .0..0..0. .0..1..1. .0..1..0. .0..1..1
..1..1..1. .1..1..0. .0..0..0. .0..1..0. .1..1..1. .1..1..1. .1..1..1
..1..1..0. .0..1..0. .1..1..0. .1..1..1. .1..1..0. .1..1..1. .1..0..1
..0..1..1. .0..1..1. .1..1..0. .0..1..0. .0..0..0. .0..1..0. .0..1..1
..1..1..1. .1..0..1. .1..0..0. .0..0..1. .0..1..0. .1..1..1. .0..1..0
..1..1..0. .1..1..1. .0..1..1. .0..1..1. .1..1..1. .0..1..0. .0..1..1
..0..0..0. .0..1..1. .0..1..1. .0..1..1. .0..1..0. .0..0..0. .0..1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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