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A316130
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T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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7
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0, 1, 1, 1, 7, 1, 2, 16, 16, 2, 3, 45, 60, 45, 3, 5, 120, 197, 197, 120, 5, 8, 333, 816, 1112, 816, 333, 8, 13, 928, 3421, 6562, 6562, 3421, 928, 13, 21, 2613, 13488, 36480, 58172, 36480, 13488, 2613, 21, 34, 7400, 54585, 204465, 493599, 493599, 204465, 54585
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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
..1....7.....16......45.......120.........333..........928...........2613
..1...16.....60.....197.......816........3421........13488..........54585
..2...45....197....1112......6562.......36480.......204465........1170851
..3..120....816....6562.....58172......493599......4133986.......35123927
..5..333...3421...36480....493599.....6605359.....83789779.....1087380450
..8..928..13488..204465...4133986....83789779...1573249156....30313615055
.13.2613..54585.1170851..35123927..1087380450..30313615055...869530995479
.21.7400.222050.6622412.298723540.14339113742.599085201676.25944283079862
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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) = 2*a(n-1) +5*a(n-2) -2*a(n-3) -12*a(n-4) -8*a(n-5) for n>6
k=3: [order 20] for n>21
k=4: [order 67] for n>69
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EXAMPLE
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Some solutions for n=5 k=4
..0..0..0..1. .0..1..1..0. .0..0..0..1. .0..1..1..1. .0..1..1..1
..1..1..0..0. .0..0..1..0. .1..0..0..0. .1..1..0..1. .1..0..0..1
..1..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .1..1..0..0
..1..0..1..0. .0..1..0..0. .0..1..1..0. .0..1..0..0. .0..0..0..0
..1..0..0..0. .0..1..1..0. .0..1..0..0. .1..1..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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