A Jacobsthal sequence trisection.

Terms

a(0) =1a(1) =5a(2) =43a(3) =341a(4) =2731a(5) =21845a(6) =174763a(7) =1398101a(8) =11184811a(9) =89478485a(10) =715827883a(11) =5726623061a(12) =45812984491a(13) =366503875925