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A178298
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Number of collinear point triples in a 5 X 5 X 5 X... n-dimensional cubic grid.
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1
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OFFSET
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0,2
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LINKS
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FORMULA
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Conjecture: a(n) = 7^n - 5^(n+1)/2 + 13^n/2 + 9^n.
Conjecture: a(n) = 34*a(n-1) - 416*a(n-2) + 2174*a(n-3) - 4095*a(n-4).
Conjectured g.f.: 2*x*(5-94*x+425*x^2)/((9*x-1)*(13*x-1)*(7*x-1)*(5*x-1)).
(End)
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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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