OFFSET
1,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (3,0,1,-3).
FORMULA
G.f.: x*(1+x)^2 / ( (x-1)*(3*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 29 2015
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved