Number of 5-ary sequences with primitive period n.

Terms

a(0) =1a(1) =5a(2) =20a(3) =120a(4) =600a(5) =3120a(6) =15480a(7) =78120a(8) =390000a(9) =1953000a(10) =9762480a(11) =48828120a(12) =244124400a(13) =1220703120a(14) =6103437480a(15) =30517574880a(16) =152587500000a(17) =762939453120