G.f. satisfies: A(x) = (1+x*A(x))*(1+x*A(x)^2)*(1+x*A(x)^3).
A212070
G.f. satisfies: A(x) = (1+x*A(x))*(1+x*A(x)^2)*(1+x*A(x)^3).
Terms
- a(0) =1a(1) =3a(2) =21a(3) =199a(4) =2166a(5) =25551a(6) =317736a(7) =4101292a(8) =54429850a(9) =738053745a(10) =10180705447a(11) =142408547576
External references
- oeis: A212070