a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of digits 2,3,4,5 and at least one of digits 6,7,8,9.
A125947
a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of digits 2,3,4,5 and at least one of digits 6,7,8,9.
Terms
- a(0) =9a(1) =81a(2) =729a(3) =6513a(4) =57369a(5) =495921a(6) =4194969a(7) =34689393a(8) =280607769a(9) =2224214961a(10) =17313344409a(11) =132651929073
External references
- oeis: A125947