OFFSET
1,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (9,0,1,-9).
FORMULA
G.f.: x*(2+2*x+x^2) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved