47070033

Appears in sequences

• G.f.: A(x) = INV(x - x*INV(x - 3*x*INV(x - 3^2*x*INV(x - 3^3*x*INV(x - 3^4*x*INV(x - ...)))))), where INV(F(x)) = series reversion of F(x).at n=6A195196