OFFSET
4,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 4..1000
FORMULA
Conjectures from Colin Barker, Dec 11 2018: (Start)
G.f.: x^4*(1 + 4*x + 4*x^2 + 7*x^3) / ((1 - x)^2*(1 + x)*(1 + x^2)*(1 + x + x^2)).
a(n) = a(n-3) + a(n-4) - a(n-7) for n>10.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 18 2018
STATUS
approved