Sequence related to fifth roots of certain Fibonacci fractions.

Terms

a(0) =15a(1) =30a(2) =91a(3) =229a(4) =612a(5) =1593a(6) =4183a(7) =10942a(8) =28659a(9) =75021a(10) =196420a(11) =514225a(12) =1346271a(13) =3524574a(14) =9227467a(15) =24157813a(16) =63245988a(17) =165580137a(18) =433494439a(19) =1134903166a(20) =2971215075a(21) =7778742045a(22) =20365011076a(23) =53316291169a(24) =139583862447a(25) =365435296158a(26) =956722026043