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A024108
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a(n) = 9^n-n^7.
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2
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1, 8, -47, -1458, -9823, -19076, 251505, 3959426, 40949569, 382637520, 3476784401, 31361572438, 282393704673, 2541803079812, 22876687041457, 205890961235274, 1853019920416385, 16677181289327896, 150094634684779089, 1350851716779120350
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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.: -(10*x^8+1071*x^7+10627*x^6+20497*x^5+8373*x^4-167*x^3-83*x^2-9*x+1) / ((x-1)^8*(9*x-1)). - Colin Barker, Mar 20 2015
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MATHEMATICA
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LinearRecurrence[{17, -100, 308, -574, 686, -532, 260, -73, 9}, {1, 8, -47, -1458, -9823, -19076, 251505, 3959426, 40949569}, 20] (* Harvey P. Dale, Mar 23 2018 *)
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PROG
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(PARI) Vec(-(10*x^8+1071*x^7+10627*x^6+20497*x^5+8373*x^4-167*x^3-83*x^2-9*x+1)/((x-1)^8*(9*x-1)) + O(x^100)) \\ Colin Barker, Mar 20 2015
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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