A156203 a(n) = 2*a(n-1) + 3 for n>1, a(1)=14.

14, 31, 65, 133, 269, 541, 1085, 2173, 4349, 8701, 17405, 34813, 69629, 139261, 278525, 557053, 1114109, 2228221, 4456445, 8912893, 17825789, 35651581, 71303165, 142606333, 285212669, 570425341, 1140850685, 2281701373

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) = 17*2^(n-1)-3.

G.f. x*(14-11*x)/((1-x)*(1-2*x)). [R. J. Mathar, Feb 09 2009]

Mathematica

CoefficientList[Series[(14 - 11 x)/((1-x) (1-2 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Apr 08 2013 *)

Prog

(Magma) [17*2^(n-1)-3: n in [1..30]]; // Vincenzo Librandi, Apr 08 2013

Crossrefs

Sequence in context: A344397 A161454 A367950 * A338389 A196135 A276301

Adjacent sequences: A156200 A156201 A156202 * A156204 A156205 A156206

Keyword

nonn,easy

Author

Vincenzo Librandi, Feb 08 2009

Extensions

Corrected typo in a(11) by R. J. Mathar, Feb 09 2009

Status

approved