a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with four times its value.
A061580
a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with four times its value.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =424a(4) =16816a(5) =42432424
External references
- oeis: A061580