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A133665
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a(n) = a(n-1) - 9*a(n-2), a(0) = 1, a(1) = 3.
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2
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1, 3, -6, -33, 21, 318, 129, -2733, -3894, 20703, 55749, -130578, -632319, 542883, 6233754, 1347807, -54755979, -66886242, 425917569, 1027893747, -2805364374, -12056408097, 13191871269, 121699544142, 2972702721, -1092323194557, -1119077519046, 8711831231967
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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.: (1+2*x)/(1-x+9*x^2).
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MATHEMATICA
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LinearRecurrence[{1, -9}, {1, 3}, 40] (* Harvey P. Dale, Apr 21 2019 *)
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PROG
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(PARI) Vec((1+2*x)/(1-x+9*x^2) + O(x^30)) \\ Jinyuan Wang, Apr 09 2020
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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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EXTENSIONS
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STATUS
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approved
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