a(n) = phi(4^n-1), where phi is Euler's totient function (A000010).
A295501
a(n) = phi(4^n-1), where phi is Euler's totient function (A000010).
Terms
- a(0) =2a(1) =8a(2) =36a(3) =128a(4) =600a(5) =1728a(6) =10584a(7) =32768a(8) =139968a(9) =480000a(10) =2640704a(11) =6635520a(12) =44717400a(13) =132765696a(14) =534600000a(15) =2147483648a(16) =11452896600a(17) =26121388032a(18) =183250539864a(19) =473702400000
External references
- oeis: A295501