Number of squarefree integers <= 10^n.

Terms

a(0) =1a(1) =7a(2) =61a(3) =608a(4) =6083a(5) =60794a(6) =607926a(7) =6079291a(8) =60792694a(9) =607927124a(10) =6079270942a(11) =60792710280a(12) =607927102274