OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (19,-19,1).
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
KEYWORD
nonn,easy
AUTHOR
Benoit Cloitre, Oct 25 2002
STATUS
approved