A199106 a(n) = 4*12^n-1.

3, 47, 575, 6911, 82943, 995327, 11943935, 143327231, 1719926783, 20639121407, 247669456895, 2972033482751, 35664401793023, 427972821516287, 5135673858195455, 61628086298345471, 739537035580145663, 8874444426961747967

Offset

0,1

Links

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

Index entries for linear recurrences with constant coefficients, signature (13,-12).

Formula

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

a(n) = 13*a(n-1)-12*a(n-2).

G.f.: (3+8*x)/((1-x)*(1-12*x)). - Bruno Berselli, Nov 03 2011

Prog

(Magma) [4*12^n-1: n in [0..20]];

Crossrefs

Sequence in context: A245014 A247024 A137611 * A197203 A197801 A239450

Adjacent sequences: A199103 A199104 A199105 * A199107 A199108 A199109

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 03 2011

Status

approved