a(n) = 2^n - A056045(n).

Terms

a(0) =1a(1) =1a(2) =4a(3) =5a(4) =26a(5) =22a(6) =120a(7) =149a(8) =418a(9) =716a(10) =2036a(11) =2378a(12) =8178a(13) =12846a(14) =29294a(15) =50709a(16) =131054a(17) =193972a(18) =524268a(19) =843260a(20) =1979520a(21) =3488618a(22) =8388584a(23) =13190042a(24) =33501276a(25) =56707912a(26) =129527950a(27) =227113934a(28) =536870882a(29) =887838482