a(n) = Sum_{j=1..10^n-1} 2^f(j) where f(j) is the number of zero digits in the decimal representation of j.
A268839
a(n) = Sum_{j=1..10^n-1} 2^f(j) where f(j) is the number of zero digits in the decimal representation of j.
Terms
- a(0) =9a(1) =108a(2) =1197a(3) =13176a(4) =144945a(5) =1594404a(6) =17538453a(7) =192922992a(8) =2122152921a(9) =23343682140a(10) =256780503549
External references
- oeis: A268839