a(n) = 10*a(n-1) + 90*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=19 .
A155017
a(n) = 10*a(n-1) + 90*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=19 .
Terms
- a(0) =1a(1) =1a(2) =19a(3) =280a(4) =4510a(5) =70300a(6) =1108900a(7) =17416000a(8) =273961000a(9) =4307050000a(10) =67726990000
External references
- oeis: A155017