a(n) = phi(4^n+1), where phi is Euler's totient function (A000010).
A366608
a(n) = phi(4^n+1), where phi is Euler's totient function (A000010).
Terms
- a(0) =1a(1) =4a(2) =16a(3) =48a(4) =256a(5) =800a(6) =3840a(7) =12544a(8) =65536a(9) =186624a(10) =986880a(11) =3345408a(12) =16515072a(13) =52306176a(14) =252645120a(15) =760320000a(16) =4288266240a(17) =13628740608a(18) =64258375680a(19) =218462552064
External references
- oeis: A366608