A164093 9*4^n+2.

38, 146, 578, 2306, 9218, 36866, 147458, 589826, 2359298, 9437186, 37748738, 150994946, 603979778, 2415919106, 9663676418, 38654705666, 154618822658, 618475290626, 2473901162498, 9895604649986, 39582418599938

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for linear recurrences with constant coefficients, signature (5,-4).

Formula

a(n) = A002063(n)+2 = 5*a(n-1)-4*a(n-2).

G.f.: 2*x*(19-22*x)/((4*x-1)*(x-1)).

Mathematica

LinearRecurrence[{5, -4}, {38, 146}, 50] (* Vincenzo Librandi, Mar 06 2012 *)

Crossrefs

Cf. A153465.

Sequence in context: A044751 A221403 A320309 * A158064 A251253 A224739

Adjacent sequences: A164090 A164091 A164092 * A164094 A164095 A164096

Keyword

nonn,easy

Author

Vincenzo Librandi, Aug 10 2009

Extensions

Edited by R. J. Mathar, Aug 21 2009

Status

approved