A198795 a(n) = 7*6^n-1.

6, 41, 251, 1511, 9071, 54431, 326591, 1959551, 11757311, 70543871, 423263231, 2539579391, 15237476351, 91424858111, 548549148671, 3291294892031, 19747769352191, 118486616113151, 710919696678911, 4265518180073471, 25593109080440831, 153558654482644991, 921351926895869951

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (7,-6).

Formula

a(n) = 6*a(n-1)+5.

a(n) = 7*a(n-1)-6*a(n-2), n>1.

G.f.: ( 6-x ) / ( (6*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011

Prog

(Magma) [7*6^n-1: n in [0..30]];

Crossrefs

Sequence in context: A196433 A197196 A295117 * A320090 A266425 A194781

Adjacent sequences: A198792 A198793 A198794 * A198796 A198797 A198798

Keyword

nonn,easy

Author

Vincenzo Librandi, Oct 30 2011

Status

approved