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A081890
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a(n) = 9^n-8^n-7^n-6^n+3*5^n.
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1
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1, 3, 7, 33, 643, 11073, 151867, 1816713, 19996963, 208630833, 2099398027, 20597485593, 198424412083, 1885822419393, 17740469253787, 165580566245673, 1535948935336003, 14178113530908753, 130361707324735147
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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G.f.: -(4182*x^4-2082*x^3+387*x^2-32*x+1)/((5*x-1)*(6*x-1)*(7*x-1)*(8*x-1)*(9*x-1)). [Colin Barker, Aug 12 2012]
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MATHEMATICA
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LinearRecurrence[{35, -485, 3325, -11274, 15120}, {1, 3, 7, 33, 643}, 30] (* Harvey P. Dale, Jun 26 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn,changed
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AUTHOR
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STATUS
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approved
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