a(n) is the number of integers k less than 10^n such that the decimal representation of k lacks the digit 1 and 2, at least one of digits 3,4, at least one of digits 5,6 and at least one of digits 7,8,9.
A126640
a(n) is the number of integers k less than 10^n such that the decimal representation of k lacks the digit 1 and 2, at least one of digits 3,4, at least one of digits 5,6 and at least one of digits 7,8,9.
Terms
- a(0) =8a(1) =60a(2) =422a(3) =2784a(4) =17318a(5) =102600a(6) =584942a(7) =3237504a(8) =17516438a(9) =93136440a(10) =488625662a(11) =2537103024a(12) =13068059558a(13) =66890498280a(14) =340713533582
External references
- oeis: A126640