Number of totients up to 10^n.

Terms

a(0) =1a(1) =6a(2) =38a(3) =291a(4) =2374a(5) =20254a(6) =180184a(7) =1634372a(8) =15037909a(9) =139847905a(10) =1311179363a(11) =12372781988a(12) =117369150635