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A178294
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Number of collinear point triples in a 4 X 4 X 4 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) = 8^n/2-3*4^n/2+6^n. a(n) = +18*a(n-1) -104*a(n-2) +192*a(n-3). G.f.: 4*x*(-1+7*x)/((6*x-1)*(8*x-1)*(4*x-1)). - R. J. Mathar, May 24 2010
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, suggested by R. J. Mathar in the Sequence Fans Mailing List, May 24 2010
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STATUS
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approved
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