a(n) = phi(8^n-1), where phi is Euler's totient function (A000010).
A366654
a(n) = phi(8^n-1), where phi is Euler's totient function (A000010).
Terms
- a(0) =6a(1) =36a(2) =432a(3) =1728a(4) =27000a(5) =139968a(6) =1778112a(7) =6635520a(8) =113467392a(9) =534600000a(10) =6963536448a(11) =26121388032a(12) =465193834560
External references
- oeis: A366654