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A305015
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T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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7
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0, 1, 1, 1, 3, 1, 2, 11, 11, 2, 3, 10, 14, 10, 3, 5, 51, 31, 31, 51, 5, 8, 165, 99, 42, 99, 165, 8, 13, 306, 206, 255, 255, 206, 306, 13, 21, 993, 455, 862, 2715, 862, 455, 993, 21, 34, 2867, 1321, 2200, 9499, 9499, 2200, 1321, 2867, 34, 55, 6818, 3108, 8807, 30457
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OFFSET
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1,5
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COMMENTS
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Table starts
..0....1....1.....2.......3.......5........8........13.........21..........34
..1....3...11....10......51.....165......306.......993.......2867........6818
..1...11...14....31......99.....206......455......1321.......3108........7353
..2...10...31....42.....255.....862.....2200......8807......33055......106158
..3...51...99...255....2715....9499....30457....225009....1046863.....4428355
..5..165..206...862....9499...28477...119835....975646....4538929....21859448
..8..306..455..2200...30457..119835...640900...6449924...41160483...271320922
.13..993.1321..8807..225009..975646..6449924.108290760..866160130..7324403720
.21.2867.3108.33055.1046863.4538929.41160483.866160130.7783586346.84091029541
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = a(n-1) +a(n-2)
k=2: a(n) = a(n-1) +3*a(n-2) +8*a(n-3) -4*a(n-4) -16*a(n-5) for n>6
k=3: [order 17] for n>18
k=4: [order 69] for n>70
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EXAMPLE
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Some solutions for n=5 k=4
..0..1..0..0. .0..1..1..1. .0..1..1..0. .0..1..1..1. .0..1..0..1
..0..0..0..1. .0..1..1..0. .0..0..0..0. .0..0..0..1. .0..1..0..1
..0..0..0..0. .1..1..1..1. .0..0..0..0. .1..0..1..0. .1..1..1..1
..1..0..1..0. .0..1..1..0. .1..1..0..1. .0..1..1..1. .0..1..0..1
..0..0..0..1. .1..0..1..1. .0..0..0..0. .0..0..0..1. .0..1..0..1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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