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A046631
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Number of cubic residues mod 3^n.
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10
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1, 3, 3, 7, 21, 57, 169, 507, 1515, 4543, 13629, 40881, 122641, 367923, 1103763, 3311287, 9933861, 29801577, 89404729, 268214187, 804642555, 2413927663, 7241782989, 21725348961, 65176046881, 195528140643, 586584421923
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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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G.f.: (-3*x^3-6*x^2+1)/((1-3*x)*(1-x^3)).
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MAPLE
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A049347 := proc(n) op( (n mod 3)+1, [1, -1, 0]) ; end proc:
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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