a(n) = 10^n + (-1)^n.
A098610
a(n) = 10^n + (-1)^n.
Terms
- a(0) =2a(1) =9a(2) =101a(3) =999a(4) =10001a(5) =99999a(6) =1000001a(7) =9999999a(8) =100000001a(9) =999999999a(10) =10000000001a(11) =99999999999
External references
- oeis: A098610
A098610
a(n) = 10^n + (-1)^n.