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A199763
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a(n) = 9*11^n+1.
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1
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10, 100, 1090, 11980, 131770, 1449460, 15944050, 175384540, 1929229930, 21221529220, 233436821410, 2567805035500, 28245855390490, 310704409295380, 3417748502249170, 37595233524740860, 413547568772149450, 4549023256493643940
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 11*a(n-1)-10.
a(n) = 12*a(n-1)-11*a(n-2).
G.f.: 10*(1-2*x)/((1-x)*(1-11*x)).
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MATHEMATICA
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9*11^Range[0, 20]+1 (* or *) LinearRecurrence[{12, -11}, {10, 100}, 20] (* Harvey P. Dale, Sep 06 2021 *)
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PROG
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(Magma) [9*11^n+1: n in [0..30]];
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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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