A199485 8*7^n+1.

9, 57, 393, 2745, 19209, 134457, 941193, 6588345, 46118409, 322828857, 2259801993, 15818613945, 110730297609, 775112083257, 5425784582793, 37980492079545, 265863444556809, 1861044111897657, 13027308783283593, 91191161482985145

Offset

0,1

Links

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

Index entries for linear recurrences with constant coefficients, signature (8,-7).

Formula

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

a(n) = 8*a(n-1)-7*a(n-2).

G.f.: 3*(3-5*x)/((1-x)*(1-7*x)).

Prog

(Magma) [8*7^n+1: n in [0..30]];

Crossrefs

Sequence in context: A262490 A180028 A155605 * A102303 A231310 A009060

Adjacent sequences: A199482 A199483 A199484 * A199486 A199487 A199488

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 07 2011

Status

approved