A modular binomial sum transform of 2^n.

Terms

a(0) =1a(1) =1a(2) =5a(3) =1a(4) =21a(5) =1a(6) =5a(7) =17a(8) =341a(9) =1a(10) =5a(11) =17a(12) =85a(13) =257a(14) =1285a(15) =4369a(16) =87381a(17) =1a(18) =5a(19) =17a(20) =85a(21) =257a(22) =1285a(23) =4369a(24) =21845a(25) =65537a(26) =327685a(27) =1114129a(28) =5570645a(29) =16843009