a(n) = |{m : multiplicative order of 6 mod m=n}|.

Terms

a(0) =2a(1) =2a(2) =2a(3) =4a(4) =4a(5) =10a(6) =2a(7) =8a(8) =12a(9) =40a(10) =6a(11) =108a(12) =6a(13) =42a(14) =40a(15) =48a(16) =30a(17) =100a(18) =6a(19) =332a(20) =10a(21) =22a(22) =30a(23) =376a(24) =26a(25) =118a(26) =48a(27) =332a(28) =2a(29) =1436