Number of cyclic numbers (A001913) <= 10^n.

Terms

a(0) =0a(1) =1a(2) =9a(3) =60a(4) =467a(5) =3617a(6) =29500a(7) =248881a(8) =2155288a(9) =19016617a(10) =170169241a(11) =1539964486a(12) =14063663530a(13) =129413160100