Number of terms of A069090 with exactly n digits.
A276707
Number of terms of A069090 with exactly n digits.
Terms
- a(0) =4a(1) =12a(2) =60a(3) =381a(4) =2522a(5) =19094a(6) =151286a(7) =1237792a(8) =10354144a(9) =88407746a(10) =766869330
External references
- oeis: A276707