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A164093
9*4^n+2.
1
38, 146, 578, 2306, 9218, 36866, 147458, 589826, 2359298, 9437186, 37748738, 150994946, 603979778, 2415919106, 9663676418, 38654705666, 154618822658, 618475290626, 2473901162498, 9895604649986, 39582418599938
OFFSET
1,1
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
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 10 2009
EXTENSIONS
Edited by R. J. Mathar, Aug 21 2009
STATUS
approved