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A094539 a(n) = A094538(n)/3. 2
0, 0, 1, 3, 11, 33, 105, 315, 961, 2883, 8697, 26091, 78411, 235233, 706113, 2118339, 6356243, 19068729, 57209865, 171629595, 514899771, 1544699313, 4634130897, 13902392691, 41707276809, 125121830427, 375365787489, 1126097362467 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

MATHEMATICA

a[0] = 1; a[n_] := a[n] = 3*a[n - 1] - If[EvenQ[n], a[n/2], 0]; Insert[Table[(3^(n) - a[n])/3, {n, 1, 30}], 0, 1] (* Stefan Steinerberger, Mar 24 2006 *)

CROSSREFS

Cf. A003000, A019308, A094538.

Sequence in context: A081673 A081250 A135247 * A295092 A032199 A018413

Adjacent sequences:  A094536 A094537 A094538 * A094540 A094541 A094542

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jun 06 2004

EXTENSIONS

More terms from Stefan Steinerberger, Mar 24 2006

STATUS

approved

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Last modified November 21 11:35 EST 2019. Contains 329370 sequences. (Running on oeis4.)