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A076684 Odd terms in A027941. 0
1, 33, 609, 10945, 196417, 3524577, 63245985, 1134903169, 20365011073, 365435296161, 6557470319841, 117669030460993, 2111485077978049, 37889062373143905, 679891637638612257, 12200160415121876737 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

FORMULA

a(n)=F(6n+3)-1 where F(k) denotes the k-th Fibonacci number

G.f.: (1+14x+x^2)/((1-x)(1-18x+x^2)).

MATHEMATICA

a[n_] := Fibonacci[6n+3]-1

PROG

(PARI) a(n)=fibonacci(6*n+3)-1

(PARI) a(n)=if(n<0, 0, subst(poltchebi(n)+poltchebi(n+1), x, 9)/5-1)

CROSSREFS

Sequence in context: A282926 A172362 A080597 * A181382 A252926 A225970

Adjacent sequences:  A076681 A076682 A076683 * A076685 A076686 A076687

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Oct 25 2002

STATUS

approved

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Last modified June 1 04:57 EDT 2020. Contains 334758 sequences. (Running on oeis4.)