a(n) = phi(n!-1), where phi is Euler's totient function (A000010).
A366759
a(n) = phi(n!-1), where phi is Euler's totient function (A000010).
Terms
- a(0) =1a(1) =4a(2) =22a(3) =96a(4) =718a(5) =5038a(6) =38544a(7) =329780a(8) =3503640a(9) =33166848a(10) =479001598a(11) =6223425864a(12) =87178291198
External references
- oeis: A366759