a(n) = Sum_{d|n} Möbius(n/d)*d^5/phi(n).

Terms

a(0) =1a(1) =31a(2) =121a(3) =496a(4) =781a(5) =3751a(6) =2801a(7) =7936a(8) =9801a(9) =24211a(10) =16105a(11) =60016a(12) =30941a(13) =86831a(14) =94501a(15) =126976a(16) =88741a(17) =303831a(18) =137561a(19) =387376a(20) =338921a(21) =499255a(22) =292561a(23) =960256a(24) =488125a(25) =959171a(26) =793881a(27) =1389296a(28) =732541a(29) =2929531