A199486 (9*7^n+1)/2.

5, 32, 221, 1544, 10805, 75632, 529421, 3705944, 25941605, 181591232, 1271138621, 8897970344, 62285792405, 436000546832, 3052003827821, 21364026794744, 149548187563205, 1046837312942432, 7327861190597021, 51295028334179144

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)-3.

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

G.f.: (5-8*x)/((1-x)*(1-7*x)).

Prog

(Magma) [(9*7^n+1)/2: n in [0..30]];

Crossrefs

Sequence in context: A024064 A164594 A305312 * A277756 A208632 A065071

Adjacent sequences: A199483 A199484 A199485 * A199487 A199488 A199489

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 07 2011

Status

approved