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3, 17, 87, 437, 2187, 10937, 54687, 273437, 1367187, 6835937, 34179687, 170898437, 854492187, 4272460937, 21362304687, 106811523437, 534057617187, 2670288085937, 13351440429687, 66757202148437, 333786010742187, 1668930053710937
(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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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (6,-5).
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FORMULA
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a(n) = 5*a(n-1)+2.
a(n) = 6*a(n-1)-5*a(n-2), n>1.
G.f.: (3 - x)/(1 - 6*x + 5*x^2). - Vincenzo Librandi, Jan 04 2013
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MATHEMATICA
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CoefficientList[Series[(3 - x)/(1 - 6*x + 5*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)
LinearRecurrence[{6, -5}, {3, 17}, 30] (* Harvey P. Dale, Jan 23 2015 *)
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PROG
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(MAGMA) [(7*5^n-1)/2: n in [0..30]]
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CROSSREFS
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Cf. A024049, A057651, A081655.
Sequence in context: A143549 A037794 A203851 * A240652 A204092 A221731
Adjacent sequences: A198763 A198764 A198765 * A198767 A198768 A198769
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Oct 30 2011
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STATUS
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approved
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