OFFSET
3,1
FORMULA
Conjectures from Colin Barker, Feb 20 2016: (Start)
a(n) = 3*a(n-1)-2*a(n-2)-a(n-4)+a(n-5) for n>7.
G.f.: x^3*(7+2*x+x^2-2*x^3) / ((1-x)^2*(1-x-x^2-x^3)).
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved