The totient of the product of unitary divisors of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =12a(6) =6a(7) =4a(8) =6a(9) =40a(10) =10a(11) =48a(12) =12a(13) =84a(14) =120a(15) =8a(16) =16a(17) =108a(18) =18a(19) =160a(20) =252a(21) =220a(22) =22a(23) =192a(24) =20a(25) =312a(26) =18a(27) =336a(28) =28a(29) =216000