A120354 a(n) = 11*3^n.

11, 33, 99, 297, 891, 2673, 8019, 24057, 72171, 216513, 649539, 1948617, 5845851, 17537553, 52612659, 157837977, 473513931, 1420541793, 4261625379, 12784876137, 38354628411, 115063885233, 345191655699, 1035574967097, 3106724901291, 9320174703873

Offset: 0

Author

Anton Joha, Jun 25 2006

Keywords

• nonn
• easy

Comments

Square root of A120353.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..300
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (3).

Crossrefs

Cf. A000244, A120353.

Programs

Magma

[11*3^n: n in [0..30]]; // Vincenzo Librandi, Jun 10 2011

Mathematica

11*3^Range[0, 60] (* Vladimir Joseph Stephan Orlovsky, Jun 09 2011 *)
NestList[3#&,11,30] (* Harvey P. Dale, Mar 04 2013 *)

PARI

a(n)=11*3^n \\ Charles R Greathouse IV, Sep 04 2013

Formula

From Philippe Deléham, Nov 23 2008: (Start)

a(n) = 3*a(n-1), n > 0; a(0)=11.

G.f.: 11/(1-3*x). (End)

a(n) = 11*A000244(n). - Michel Marcus, Sep 04 2013

E.g.f.: 11*exp(3*x). - Elmo R. Oliveira, Aug 16 2024

Extensions

Better definition from Tanya Khovanova, Jan 20 2007