a(n) = 10^(2*n+1) - 4*10^n - 1.A332195a(n) = 10^(2*n+1) - 4*10^n - 1.Terms a(0) =5a(1) =959a(2) =99599a(3) =9995999a(4) =999959999a(5) =99999599999External referencesoeis: A332195