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A316949
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Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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2, 98, 1240, 18956, 287292, 4335826, 65510494, 989703110, 14951804382, 225883580652, 3412521523118, 51554446712590, 778855465200848, 11766508452169318, 177761763728514408, 2685524323129042060
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 12*a(n-1) +38*a(n-2) +130*a(n-3) +69*a(n-4) +144*a(n-5) -193*a(n-6) -26*a(n-7) -60*a(n-8) +166*a(n-9) -97*a(n-10) +44*a(n-11) -44*a(n-12) +16*a(n-13)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..0..1. .0..0..1..0. .0..0..1..0. .0..0..1..0
..0..1..1..0. .0..1..1..0. .1..0..0..1. .0..1..1..1. .0..1..0..0
..0..0..0..1. .1..1..0..0. .0..1..1..0. .0..1..0..1. .0..1..0..1
..1..0..0..1. .0..1..0..0. .0..1..0..0. .1..0..0..0. .0..0..1..1
..0..0..0..0. .1..0..1..0. .1..0..1..0. .1..1..1..0. .1..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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