a(n) = 9*n*10^(n-1).
A212704
a(n) = 9*n*10^(n-1).
Terms
- a(0) =9a(1) =180a(2) =2700a(3) =36000a(4) =450000a(5) =5400000a(6) =63000000a(7) =720000000a(8) =8100000000a(9) =90000000000a(10) =990000000000
External references
- oeis: A212704
A212704
a(n) = 9*n*10^(n-1).