A199028 (9*11^n-1)/2.

4, 49, 544, 5989, 65884, 724729, 7972024, 87692269, 964614964, 10610764609, 116718410704, 1283902517749, 14122927695244, 155352204647689, 1708874251124584, 18797616762370429, 206773784386074724, 2274511628246821969

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)+5.

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

G.f.: (4 + x)/(1 - 12*x + 11*x^2). - Vincenzo Librandi, Jan 04 2013

Mathematica

CoefficientList[Series[(4 + x)/(1 - 12 x + 11 x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)

Prog

(Magma) [(9*11^n-1)/2: n in [0..20]];

Crossrefs

Sequence in context: A348547 A348425 A273230 * A189146 A086094 A055793

Adjacent sequences: A199025 A199026 A199027 * A199029 A199030 A199031

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 02 2011

Status

approved