Column 1 of the array in A107735.

Terms

a(0) =1a(1) =2a(2) =5a(3) =4a(4) =21a(5) =8a(6) =85a(7) =16a(8) =341a(9) =32a(10) =1365a(11) =64a(12) =5461a(13) =128a(14) =21845a(15) =256a(16) =87381a(17) =512a(18) =349525a(19) =1024a(20) =1398101a(21) =2048a(22) =5592405a(23) =4096a(24) =22369621a(25) =8192a(26) =89478485a(27) =16384a(28) =357913941a(29) =32768