A199029 a(n) = 9*11^n-1.

8, 98, 1088, 11978, 131768, 1449458, 15944048, 175384538, 1929229928, 21221529218, 233436821408, 2567805035498, 28245855390488, 310704409295378, 3417748502249168, 37595233524740858, 413547568772149448, 4549023256493643938

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..900

Index entries for linear recurrences with constant coefficients, signature (12,-11).

Formula

a(n) = 11*a(n-1)+10.

a(n) = 12*a(n-1)-11*a(n-2).

G.f.: 2*(4+x)/((1-x)*(1-11*x)). a(n) = 2*A199028(n). - Bruno Berselli, Nov 03 2011

Prog

(Magma) [9*11^n-1: n in [0..20]];

Crossrefs

Cf. A199028.

Sequence in context: A290242 A116229 A099150 * A228329 A228794 A211869

Adjacent sequences: A199026 A199027 A199028 * A199030 A199031 A199032

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 03 2011

Status

approved