a(n) = -A065395(2^n).

Terms

a(0) =0a(1) =1a(2) =3a(3) =1a(4) =15a(5) =5a(6) =63a(7) =1a(8) =177a(9) =89a(10) =913a(11) =-319a(12) =4095a(13) =2393a(14) =10617a(15) =1a(16) =65535a(17) =8897a(18) =262143a(19) =-44287a(20) =729537a(21) =543553a(22) =4015777a(23) =-1753087a(24) =15622785a(25) =11162969a(26) =46358529a(27) =-1452031a(28) =265390977a(29) =-2270911