a(n) = ((9*n + 8)*10^n - 8)/9.
A294327
a(n) = ((9*n + 8)*10^n - 8)/9.
Terms
- a(0) =0a(1) =18a(2) =288a(3) =3888a(4) =48888a(5) =588888a(6) =6888888a(7) =78888888a(8) =888888888a(9) =9888888888a(10) =108888888888
External references
- oeis: A294327
A294327
a(n) = ((9*n + 8)*10^n - 8)/9.