a(n) = (10^(2n+1)-1)/3 + 2*10^n.A332135a(n) = (10^(2n+1)-1)/3 + 2*10^n.Terms a(0) =5a(1) =353a(2) =33533a(3) =3335333a(4) =333353333a(5) =33333533333External referencesoeis: A332135