OFFSET
0,2
COMMENTS
After the first term, the sequence is periodic with period 8: repeat {21, 51, 101, 107, 97, 67, 17, 11}.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,0,-1,1).
FORMULA
G.f.: (1 + 20*x + 30*x^2 + 50*x^3 + 7*x^4 + 10*x^5)/((1 - x)*(1 + x^4)).
MATHEMATICA
CoefficientList[Series[(1 + 20 x + 30 x^2 + 50 x^3 + 7 x^4 + 10 x^5)/((1 - x) (1 + x^4)), {x, 0, 100}], x]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Shara Lalo, May 23 2018
STATUS
approved