4,2

Alois P. Heinz, Table of n, a(n) for n = 4..1000

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)

Column k=4 of A242887.

Sequence in context: A339756 A163369 A290841 * A254267 A028266 A275982

Adjacent sequences: A321771 A321772 A321773 * A321775 A321776 A321777

nonn

Alois P. Heinz, Nov 18 2018

approved