a(n) = M(n!), the value of Mertens's function at the n-th factorial.

Terms

a(0) =1a(1) =1a(2) =0a(3) =-1a(4) =-2a(5) =-3a(6) =-3a(7) =-6a(8) =-15a(9) =-138a(10) =-26a(11) =-527a(12) =-3474a(13) =-19550a(14) =-20014a(15) =3084a(16) =-1253696a(17) =7121000a(18) =-18636176a(19) =-44667415a(20) =94933922a(21) =-848322099