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1, 73, 721, 6553, 59041, 531433, 4782961, 43046713, 387420481, 3486784393, 31381059601, 282429536473, 2541865828321, 22876792454953, 205891132094641, 1853020188851833, 16677181699666561, 150094635296999113
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = 10*a(n-1) - 9*a(n-2) for n>2, a(1)=1, a(2)=73. - Vincenzo Librandi, Feb 06 2013
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MATHEMATICA
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CoefficientList[Series[(1 + 63 x)/(1 - 10 x + 9 x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 06 2013 *)
LinearRecurrence[{10, -9}, {1, 73}, 20] (* Harvey P. Dale, May 22 2014 *)
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PROG
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(Magma) [9^n-8: n in [1..20]];
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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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