A198690 9*7^n-1.

8, 62, 440, 3086, 21608, 151262, 1058840, 7411886, 51883208, 363182462, 2542277240, 17795940686, 124571584808, 872001093662, 6104007655640, 42728053589486, 299096375126408, 2093674625884862, 14655722381194040, 102590056668358286

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), n>1.

G.f. ( 8-2*x ) / ( (7*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011

Mathematica

9*7^Range[0, 30]-1 (* or *) LinearRecurrence[{8, -7}, {8, 62}, 30] (* Harvey P. Dale, Apr 22 2019 *)

Prog

(Magma) [9*7^n-1: n in [0..30]]

Crossrefs

Cf. A024075, A048473, A081655, A198480, A198647.

Sequence in context: A044527 A269607 A296584 * A056054 A167251 A227439

Adjacent sequences: A198687 A198688 A198689 * A198691 A198692 A198693

Keyword

nonn,easy

Author

Vincenzo Librandi, Oct 29 2011

Status

approved