Number of n-digit positive integers that undulate.

A343462

Number of n-digit positive integers that undulate.

Terms

    a(0) =9a(1) =81a(2) =525a(3) =3105a(4) =18939a(5) =114381a(6) =693129a(7) =4195557a(8) =25405586a(9) =153820395a(10) =931359050a(11) =5639156409a(12) =34143908573a(13) =206733865761

External references