A000041(n) - A000203(n).

Terms

a(0) =0a(1) =-1a(2) =-1a(3) =-2a(4) =1a(5) =-1a(6) =7a(7) =7a(8) =17a(9) =24a(10) =44a(11) =49a(12) =87a(13) =111a(14) =152a(15) =200a(16) =279a(17) =346a(18) =470a(19) =585a(20) =760a(21) =966a(22) =1231a(23) =1515a(24) =1927a(25) =2394a(26) =2970a(27) =3662a(28) =4535a(29) =5532