a(n) = n*(n-1)*9^n.

Terms

a(0) =0a(1) =0a(2) =162a(3) =4374a(4) =78732a(5) =1180980a(6) =15943230a(7) =200884698a(8) =2410616376a(9) =27894275208a(10) =313810596090