Fibonacci 13-step numbers.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =1a(13) =1a(14) =2a(15) =4a(16) =8a(17) =16a(18) =32a(19) =64a(20) =128a(21) =256a(22) =512a(23) =1024a(24) =2048a(25) =4096a(26) =8191a(27) =16381a(28) =32760a(29) =65516