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

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =-3a(6) =6a(7) =-2a(8) =-1a(9) =-10a(10) =10a(11) =-22a(12) =12a(13) =-21a(14) =-40a(15) =-20a(16) =16a(17) =-55a(18) =18a(19) =-80a(20) =-98a(21) =-55a(22) =22a(23) =-90a(24) =-101a(25) =-78a(26) =-138a(27) =-182a(28) =28a(29) =-271