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3, 25, 223, 2005, 18043, 162385, 1461463, 13153165, 118378483, 1065406345, 9588657103, 86297913925, 776681225323, 6990131027905, 62911179251143, 566200613260285, 5095805519342563, 45862249674083065, 412760247066747583
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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) = 9*a(n-1)-2.
a(n) = 10*a(n-1)-9*a(n-2).
G.f.: (3-5*x)/((1-x)*(1-9*x)).
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MATHEMATICA
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(11 9^Range[0, 20]+1)/4 (* or *) LinearRecurrence[{10, -9}, {3, 25}, 20] (* Harvey P. Dale, Apr 29 2019 *)
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PROG
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(Magma) [(11*9^n+1)/4: 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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