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

Terms

a(0) =1a(1) =-1a(2) =4a(3) =-6a(4) =6a(5) =-3a(6) =8a(7) =-22a(8) =20a(9) =0a(10) =12a(11) =-44a(12) =14a(13) =7a(14) =72a(15) =-95a(16) =18a(17) =-10a(18) =20a(19) =-71a(20) =142a(21) =33a(22) =24a(23) =-399a(24) =152a(25) =52a(26) =248a(27) =-57a(28) =30a(29) =-121