G.f.: (4-4*x-20*x^2)/(1-19*x+2*x^2+78*x^3).
A203073
G.f.: (4-4*x-20*x^2)/(1-19*x+2*x^2+78*x^3).
Terms
- a(0) =4a(1) =72a(2) =1340a(3) =25004a(4) =466780a(5) =8714292a(6) =162687676a(7) =3037228420a(8) =56702249852
External references
- oeis: A203073
A203073
G.f.: (4-4*x-20*x^2)/(1-19*x+2*x^2+78*x^3).