a(n) = 5^n mod 2^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =1a(5) =21a(6) =9a(7) =45a(8) =225a(9) =357a(10) =761a(11) =1757a(12) =2641a(13) =5013a(14) =489a(15) =18829a(16) =28609a(17) =11973a(18) =59865a(19) =37181a(20) =185905a(21) =929525a(22) =2550473a(23) =4363757a(24) =13430177a(25) =42021a(26) =33764537a(27) =34604957a(28) =38807057a(29) =194035285