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A304053
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Number of nX3 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
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1
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1, 11, 6, 18, 32, 60, 124, 288, 598, 1266, 2910, 6362, 13924, 31578, 70292, 156670, 353098, 791762, 1776560, 3999190, 8991152, 20221266, 45520396, 102442546, 230580304, 519141320, 1168761696, 2631446768, 5925181452, 13341570650
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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) +2*a(n-2) +7*a(n-3) -3*a(n-4) -11*a(n-5) -21*a(n-6) -8*a(n-7) +13*a(n-8) +25*a(n-9) +22*a(n-10) +4*a(n-11) +3*a(n-12) -6*a(n-13) -6*a(n-14) -9*a(n-15) for n>18
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..1..0. .0..1..1. .0..1..1. .0..0..0. .0..0..1. .0..1..0
..1..1..0. .0..0..0. .1..0..1. .0..0..0. .0..1..1. .1..1..1. .0..1..0
..1..1..0. .0..0..0. .0..0..1. .0..0..0. .0..1..1. .1..1..1. .1..1..1
..0..0..0. .1..0..1. .0..1..1. .1..0..1. .0..0..1. .0..1..0. .0..1..0
..1..1..0. .0..0..0. .1..0..1. .1..0..1. .0..1..0. .1..1..1. .0..1..0
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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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