Number of n-digit numbers where every digit is either a 9 or adjacent to a 9.
A377207
Number of n-digit numbers where every digit is either a 9 or adjacent to a 9.
Terms
- a(0) =1a(1) =18a(2) =99a(3) =342a(4) =2691a(5) =13788a(6) =65709a(7) =407772a(8) =2115981a(9) =11108358a(10) =63181719a(11) =334551402a(12) =1802963871a(13) =9931645728a(14) =53256984129a(15) =288681869232
External references
- oeis: A377207