a(n) = (1/2)*A050871 (row sums of array T in A050870, periodic binary words).

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =8a(5) =17a(6) =38a(7) =65a(8) =128a(9) =284a(10) =518a(11) =1025a(12) =2168a(13) =4097a(14) =8198a(15) =16907a(16) =32768a(17) =65537a(18) =133088a(19) =262145a(20) =524408a(21) =1056731a(22) =2097158a(23) =4194305a(24) =8421248a(25) =16777712a(26) =33554438a(27) =67239680a(28) =134217848a(29) =268435457