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A306138
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Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 23, 90, 521, 2787, 14804, 79839, 428041, 2296512, 12329851, 66162665, 355098680, 1905814101, 10228215869, 54894290098, 294613084651, 1581163788591, 8485982858500, 45543581015859, 244428741410877, 1311829444865816
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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) = 3*a(n-1) +11*a(n-2) +16*a(n-3) -34*a(n-4) -20*a(n-5) +28*a(n-6) -49*a(n-8) -17*a(n-9) +37*a(n-10) -2*a(n-11) -36*a(n-12) -56*a(n-13) -16*a(n-14) +16*a(n-15) for n>16
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..1..1. .0..0..0. .0..1..0. .0..1..1. .0..1..0. .0..1..1
..0..1..0. .1..1..0. .1..0..1. .1..0..1. .1..1..0. .0..1..1. .0..0..1
..0..0..0. .1..0..0. .1..0..1. .1..0..0. .1..0..0. .0..0..0. .1..0..0
..1..1..0. .0..1..0. .1..1..0. .0..0..1. .0..1..0. .0..1..1. .1..0..0
..0..0..0. .0..0..0. .0..0..1. .1..0..1. .0..0..1. .0..1..0. .0..0..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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