a(n) = 5*11^n - 1.A199022a(n) = 5*11^n - 1.Terms a(0) =4a(1) =54a(2) =604a(3) =6654a(4) =73204a(5) =805254a(6) =8857804a(7) =97435854a(8) =1071794404a(9) =11789738454a(10) =129687123004External referencesoeis: A199022