Order of Fibonacci group F(n,4) (or 0 if the group is infinite).

Terms

a(0) =0a(1) =5a(2) =0a(3) =3a(4) =624a(5) =125a(6) =0a(7) =7a(8) =6560a(9) =4905a(10) =0a(11) =11a(12) =28560a(13) =104845a(14) =0a(15) =15a(16) =83520a(17) =2236945a(18) =0a(19) =19a(20) =194480a(21) =43997205a(22) =0a(23) =23a(24) =390624a(25) =839065625a(26) =0a(27) =27a(28) =707280a(29) =15568306205