login
A199106
a(n) = 4*12^n-1.
1
3, 47, 575, 6911, 82943, 995327, 11943935, 143327231, 1719926783, 20639121407, 247669456895, 2972033482751, 35664401793023, 427972821516287, 5135673858195455, 61628086298345471, 739537035580145663, 8874444426961747967
OFFSET
0,1
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
MATHEMATICA
Table[4*12^n-1, {n, 0, 20}] (* Jake L Lande, Jun 30 2024 *)
PROG
(Magma) [4*12^n-1: n in [0..20]];
CROSSREFS
Sequence in context: A245014 A247024 A137611 * A197203 A197801 A239450
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 03 2011
STATUS
approved