A199751 (3*11^n+1)/2.

2, 17, 182, 1997, 21962, 241577, 2657342, 29230757, 321538322, 3536921537, 38906136902, 427967505917, 4707642565082, 51784068215897, 569624750374862, 6265872254123477, 68924594795358242, 758170542748940657, 8339875970238347222

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..900

Index entries for linear recurrences with constant coefficients, signature (12,-11).

Formula

a(n) = 11*a(n-1)-5.

a(n) = 12*a(n-1)-11*a(n-2).

G.f.: (2-7*x)/((1-x)*(1-11*x)).

Mathematica

(3*11^Range[0, 20]+1)/2 (* or *) LinearRecurrence[{12, -11}, {2, 17}, 20] (* Harvey P. Dale, Sep 23 2013 *)

Prog

(Magma) [(3*11^n+1)/2: n in [0..30]];

Crossrefs

Sequence in context: A230087 A058010 A242428 * A348766 A367839 A126752

Adjacent sequences: A199748 A199749 A199750 * A199752 A199753 A199754

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 10 2011

Status

approved