a(n) = Sum_{d|n} mu(d) * binomial(d + n/d - 2, d-1).

Terms

a(0) =1a(1) =0a(2) =0a(3) =-1a(4) =0a(5) =-4a(6) =0a(7) =-3a(8) =-5a(9) =-8a(10) =0a(11) =-9a(12) =0a(13) =-12a(14) =-28a(15) =-7a(16) =0a(17) =-8a(18) =0a(19) =-34a(20) =-54a(21) =-20a(22) =0a(23) =9a(24) =-69a(25) =-24a(26) =-44a(27) =-83a(28) =0a(29) =0