a(n) = 2^n - A285103(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =10a(5) =20a(6) =52a(7) =112a(8) =234a(9) =484a(10) =992a(11) =2018a(12) =4060a(13) =8140a(14) =16336a(15) =32706a(16) =65474a(17) =131004a(18) =262056a(19) =524184a(20) =1048460a(21) =2097044a(22) =4194176a(23) =8388480a(24) =16777084a(25) =33554264a(26) =67108704a(27) =134217560a(28) =268435256a(29) =536870708