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A133672
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a(n) = a(n-1) - 81*a(n-2), a(0)=1, a(1)=9.
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1
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1, 9, -72, -801, 5031, 69912, -337599, -6000471, 21345048, 507383199, -1221565689, -42319604808, 56627216001, 3484515205449, -1102289290632, -283348020932001, -194062588390809, 22757127107101272, 38476196766756801, -1804851098908446231
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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+8*x)/(1-x+81*x^2).
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MATHEMATICA
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LinearRecurrence[{1, -81}, {1, 9}, 30] (* Harvey P. Dale, Aug 01 2016 *)
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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