OFFSET
0,2
COMMENTS
a(n)/a(n-1) tends to -9.
First term < 0: a(27) = -60053864762402471338497.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (-1, 72).
FORMULA
G.f.: (1+10*x)/(1+x-72*x^2).
a(n) = Sum_{k=0..n} A112555(n,k)*8^k.
a(n) = (18*8^n-(-9)^n)/17. - Klaus Brockhaus, Sep 26 2009
E.g.f.: (18*exp(8*x) - exp(-9*x))/17. - G. C. Greubel, Oct 21 2018
MATHEMATICA
LinearRecurrence[{-1, 72}, {1, 9}, 30] (* Harvey P. Dale, Oct 15 2012 *)
PROG
(PARI) vector(30, n, n--; (18*8^n-(-9)^n)/17) \\ G. C. Greubel, Oct 21 2018
(Magma) [(18*8^n-(-9)^n)/17: n in [0..30]]; // G. C. Greubel, Oct 21 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Philippe Deléham, Sep 21 2009
STATUS
approved
