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A316448
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T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 3, 5, 6 or 8 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, 57, 45, 3, 5, 120, 182, 182, 120, 5, 8, 333, 712, 946, 712, 333, 8, 13, 928, 2832, 5256, 5256, 2832, 928, 13, 21, 2613, 10696, 26592, 43568, 26592, 10696, 2613, 21, 34, 7400, 41107, 139705, 325839, 325839, 139705, 41107
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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.....57.....182.......712.......2832........10696.........41107
..2...45....182.....946......5256......26592.......139705........743357
..3..120....712....5256.....43568.....325839......2520180......19750414
..5..333...2832...26592....325839....3624515.....39827783.....450251619
..8..928..10696..139705...2520180...39827783....621643922...10080547097
.13.2613..41107..743357..19750414..450251619..10080547097..235652502418
.21.7400.157988.3895564.153125421.5054524591.161747868059.5454074957154
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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 69] for n>71
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EXAMPLE
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Some solutions for n=5 k=4
..0..0..1..1. .0..1..0..0. .0..1..1..0. .0..1..1..0. .0..1..0..0
..0..1..0..1. .0..1..1..0. .0..1..0..1. .0..0..1..1. .1..1..0..1
..1..0..0..1. .0..0..1..0. .0..0..1..1. .0..1..1..1. .0..0..0..0
..1..1..1..1. .1..0..1..0. .1..1..1..1. .0..0..1..0. .1..0..0..1
..0..0..0..0. .1..1..1..0. .1..0..1..0. .1..0..1..1. .0..0..1..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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