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34, 142, 574, 2302, 9214, 36862, 147454, 589822, 2359294, 9437182, 37748734, 150994942, 603979774, 2415919102, 9663676414, 38654705662, 154618822654, 618475290622, 2473901162494, 9895604649982, 39582418599934
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index to sequences with linear recurrences with constant coefficients, signature (5,-4).
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FORMULA
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a(n)=A002063(n)-2. [From R. J. Mathar, Jan 03 2009]
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MATHEMATICA
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LinearRecurrence[{5, -4}, {34, 142}, 50] (* Vincenzo Librandi, Feb 22 2012 *)
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PROG
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(PARI) a(n)=9*4^n-2 \\ Charles R Greathouse IV, Jan 11 2012
(MAGMA) I:=[34, 142]; [n le 2 select I[n] else 5*Self(n-1)-4*Self(n-2): n in [1..50]]; // Vincenzo Librandi, Feb 22 2012
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CROSSREFS
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Sequence in context: A172001 A158062 A141127 * A105714 A072319 A031398
Adjacent sequences: A153462 A153463 A153464 * A153466 A153467 A153468
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KEYWORD
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nonn,easy,changed
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AUTHOR
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Vincenzo Librandi, Dec 27 2008
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STATUS
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approved
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