Euler's totient of A104350(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =48a(6) =288a(7) =576a(8) =1728a(9) =8640a(10) =86400a(11) =259200a(12) =3110400a(13) =21772800a(14) =108864000a(15) =217728000a(16) =3483648000a(17) =10450944000a(18) =188116992000a(19) =940584960000