a(n) = (10^(2n+1)-1)/3 - 3*10^n.A332130a(n) = (10^(2n+1)-1)/3 - 3*10^n.Terms a(0) =0a(1) =303a(2) =33033a(3) =3330333a(4) =333303333a(5) =33333033333External referencesoeis: A332130