Number of solutions to the equation phi(x) = n!.

Terms

a(0) =2a(1) =3a(2) =4a(3) =10a(4) =17a(5) =49a(6) =93a(7) =359a(8) =1138a(9) =3802a(10) =12124a(11) =52844a(12) =182752a(13) =696647a(14) =2852886a(15) =16423633a(16) =75301815a(17) =367900714a(18) =1531612895a(19) =8389371542a(20) =40423852287a(21) =213232272280