A022354 Fibonacci sequence beginning 0, 20.

0, 20, 20, 40, 60, 100, 160, 260, 420, 680, 1100, 1780, 2880, 4660, 7540, 12200, 19740, 31940, 51680, 83620, 135300, 218920, 354220, 573140, 927360, 1500500, 2427860, 3928360, 6356220, 10284580

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (1, 1).

Formula

G.f.: 20*x/(1-x-x^2). - Philippe Deléham, Nov 20 2008

a(n) = 20*A000045(n). - G. C. Greubel, Aug 26 2017

Mathematica

a={}; b=0; c=20; AppendTo[a, b]; AppendTo[a, c]; Do[b=b+c; AppendTo[a, b]; c=b+c; AppendTo[a, c], {n, 4!}]; a (* Vladimir Joseph Stephan Orlovsky, Sep 17 2008 *)
Table[20*Fibonacci[n], {n, 0, 50}] (* or *) LinearRecurrence[{1, 1}, {0, 20}, 50] (* G. C. Greubel, Aug 26 2017 *)

Prog

(PARI) for(n=0, 50, print1(20*fibonacci(n), ", ")) \\ G. C. Greubel, Aug 26 2017

Crossrefs

Sequence in context: A278830 A040381 A354569 * A302363 A165841 A222958

Adjacent sequences: A022351 A022352 A022353 * A022355 A022356 A022357

Keyword

nonn

Author

N. J. A. Sloane

Status

approved