a(n) = 2^n - A056188(n).

Terms

a(0) =1a(1) =2a(2) =2a(3) =8a(4) =2a(5) =52a(6) =2a(7) =128a(8) =170a(9) =764a(10) =2a(11) =2488a(12) =2a(13) =11624a(14) =16928a(15) =32768a(16) =2a(17) =181324a(18) =2a(19) =555296a(20) =931610a(21) =2802584a(22) =2a(23) =11007664a(24) =6643782a(25) =43955032a(26) =44739242a(27) =136585808a(28) =2a(29) =720895864