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A219406
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Unmatched value maps: number of n X 4 binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..2 n X 4 array.
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1
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7, 98, 1199, 14737, 181089, 2225293, 27345143, 336026564, 4129209727, 50741147949, 623524656508, 7662085181924, 94154334887381, 1157000812187473, 14217623447617101, 174711041141292808, 2146909292479553912
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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) = 7*a(n-1) + 57*a(n-2) + 96*a(n-3) + 27*a(n-4) - 11*a(n-5) - 4*a(n-6).
Empirical g.f.: x*(1 + 2*x)*(7 + 35*x + 44*x^2 - 2*x^3 - 6*x^4) / (1 - 7*x - 57*x^2 - 96*x^3 - 27*x^4 + 11*x^5 + 4*x^6). - Colin Barker, Jul 26 2018
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EXAMPLE
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Some solutions for n=3:
..1..1..1..1....1..0..1..1....1..1..0..0....1..0..0..0....1..0..0..0
..1..0..0..0....0..1..0..1....1..0..0..1....1..0..1..1....1..0..1..1
..1..0..0..0....1..0..1..1....1..0..1..1....0..0..0..1....0..1..1..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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