OFFSET
0,2
FORMULA
Conjectures from Colin Barker, Jan 30 2016: (Start)
a(n) = a(n-1)+a(n-3)-a(n-4) for n>4.
G.f.: x*(2+x-3*x^2+3*x^3-x^5-x^6) / ((1-x)^2*(1+x+x^2)).
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 17 2016
STATUS
approved