A027117 a(n) = A027113(n, n+4).

16, 59, 155, 352, 738, 1475, 2861, 5444, 10232, 19079, 35395, 65452, 120786, 222615, 409965, 754616, 1388592, 2554723, 4699643, 8644840, 15901266, 29247995, 53796541, 98948444, 181995832, 334743887, 615691459, 1132434708

Offset: 4

Author

Clark Kimberling

Keywords

• nonn

Formula

Conjectures from Colin Barker, Feb 20 2016: (Start)

a(n) = 4*a(n-1)-5*a(n-2)+2*a(n-3)-a(n-4)+2*a(n-5)-a(n-6) for n>9.

G.f.: x^4*(16-5*x-x^2-5*x^3+3*x^4) / ((1-x)^3*(1-x-x^2-x^3)).

(End)