A015938(n)-2^n.

Terms

a(0) =1a(1) =2a(2) =1a(3) =4a(4) =24a(5) =2a(6) =5a(7) =4a(8) =1a(9) =6a(10) =43a(11) =32a(12) =401a(13) =10a(14) =427a(15) =48a(16) =273a(17) =32a(18) =701a(19) =84a(20) =139a(21) =1338a(22) =389a(23) =56a(24) =93a(25) =334a(26) =1a(27) =12a(28) =4841a(29) =86