a(n) = 2^(n-5) - A000931(n).

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =14a(5) =29a(6) =60a(7) =123a(8) =249a(9) =503a(10) =1012a(11) =2032a(12) =4075a(13) =8164a(14) =16347a(15) =32719a(16) =65471a(17) =130986a(18) =262030a(19) =524137a(20) =1048376a(21) =2096887a(22) =4193953a(23) =8388143a(24) =16776600a(25) =33553616a(26) =67107783a(27) =134216296a(28) =268433559a(29) =536868399