A199422 5*7^n+1.

6, 36, 246, 1716, 12006, 84036, 588246, 4117716, 28824006, 201768036, 1412376246, 9886633716, 69206436006, 484445052036, 3391115364246, 23737807549716, 166164652848006, 1163152569936036, 8142067989552246, 56994475926865716

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) = 6*A083067(n).

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

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

G.f.: 6*(1-2*x)/((1-x)*(1-7*x)).

Mathematica

5*7^Range[0, 20]+1 (* or *) LinearRecurrence[{8, -7}, {6, 36}, 20] (* Harvey P. Dale, Dec 23 2012 *)

Prog

(Magma) [5*7^n+1: n in [0..30]];

Crossrefs

Sequence in context: A180119 A181964 A354457 * A049431 A049428 A129063

Adjacent sequences: A199419 A199420 A199421 * A199423 A199424 A199425

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 07 2011

Status

approved