a(n) = (Product_{i=1..n-1} (2^i + 1)) modulo (2^n - 1).

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =9a(6) =1a(7) =0a(8) =74a(9) =33a(10) =1a(11) =1170a(12) =1a(13) =129a(14) =15101a(15) =0a(16) =1a(17) =187758a(18) =1a(19) =67650a(20) =615700a(21) =2049a(22) =1a(23) =4793490a(24) =3247204a(25) =8193a(26) =262658a(27) =4227330a(28) =1a(29) =480000312