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A298585
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Number of nX4 0..1 arrays with every element equal to 0, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 2, 5, 4, 13, 31, 83, 262, 819, 2690, 8887, 29665, 99320, 333338, 1119938, 3764541, 12659539, 42574893, 143200453, 481671189, 1620186045, 5449885061, 18332044657, 61664686672, 207425872879, 697733534147, 2347018911372, 7894845781765
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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) = 2*a(n-1) +7*a(n-2) +5*a(n-3) -35*a(n-4) -43*a(n-5) -2*a(n-6) +110*a(n-7) +102*a(n-8) +114*a(n-9) -67*a(n-10) -202*a(n-11) -325*a(n-12) -89*a(n-13) +61*a(n-14) +109*a(n-15) +328*a(n-16) +163*a(n-17) +194*a(n-18) -164*a(n-19) -33*a(n-20) -176*a(n-21) -212*a(n-22) +41*a(n-23) +14*a(n-24) +15*a(n-25) +62*a(n-26) +41*a(n-27) -27*a(n-28) +13*a(n-29) +11*a(n-30) -14*a(n-31) +2*a(n-32) -a(n-33) -3*a(n-34)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0
..0..0..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0
..0..1..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..0. .0..0..1..0
..0..0..0..0. .0..0..1..1. .1..1..0..0. .0..0..1..1. .0..0..0..0
..0..0..0..0. .0..0..1..1. .1..1..0..0. .0..0..1..1. .0..0..0..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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