OFFSET
0,2
COMMENTS
Partial sums are 1, 10, 55, 280, 1405, 7030, ...
Apparently a duplicate of A189274. - R. J. Mathar, May 13 2016
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (5).
FORMULA
G.f.: (1+4*x) / (1-5*x).
a(n) = 5*a(n-1) for n>1.
a(n) = 9*5^(n-1) for n>0.
MATHEMATICA
CoefficientList[Series[(1 + 4 x)/(1 - 5 x), {x, 0, 23}], x] (* Michael De Vlieger, Mar 19 2016 *)
PROG
(PARI) Vec((1+4*x)/(1-5*x) + O(x^30))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Colin Barker, Mar 19 2016
STATUS
approved