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A097135 a(0) = 1; for n>0, a(n) = 3*Fibonacci(n). 4
1, 3, 3, 6, 9, 15, 24, 39, 63, 102, 165, 267, 432, 699, 1131, 1830, 2961, 4791, 7752, 12543, 20295, 32838, 53133, 85971, 139104, 225075, 364179, 589254, 953433, 1542687, 2496120, 4038807, 6534927, 10573734, 17108661, 27682395, 44791056, 72473451, 117264507 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Binomial transform is A097136.

LINKS

Table of n, a(n) for n=0..38.

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

FORMULA

G.f. : (1+2*x-x^2)/(1-x-x^2).

a(n) = a(n-1)+a(n-2) for n>2.

a(2n) = A097134(n); a(2n+1) = 3*F(2n+1).

a(n) = L(n+1)-F(n-1) for n>=1, where L=A000032 and F=A000045. - Paolo P. Lava, Sep 17 2015

MATHEMATICA

Join[{1}, Table[3*Fibonacci[n], {n, 70}]] (* Vladimir Joseph Stephan Orlovsky, Feb 10 2012 *)

PROG

(PARI) a(n)=if(n, 3*finonacci(n), 1) \\ Charles R Greathouse IV, Oct 16 2015

CROSSREFS

Cf. A000032, A000045.

Essentially the same as A022086.

Sequence in context: A050337 A299473 A022086 * A293677 A293679 A274498

Adjacent sequences:  A097132 A097133 A097134 * A097136 A097137 A097138

KEYWORD

nonn,easy

AUTHOR

Paul Barry, Jul 26 2004

EXTENSIONS

Definition rewritten by N. J. A. Sloane, Jan 24 2010

STATUS

approved

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Last modified September 24 20:09 EDT 2018. Contains 315356 sequences. (Running on oeis4.)