9*n analog to Keith numbers.

Terms

a(0) =9a(1) =17a(2) =48a(3) =55a(4) =96a(5) =120a(6) =124a(7) =131a(8) =244a(9) =426a(10) =787a(11) =1893a(12) =5307a(13) =5364a(14) =5600a(15) =10083a(16) =31085a(17) =46733a(18) =52700a(19) =53456a(20) =56857a(21) =56920a(22) =109620a(23) =110313a(24) =110376a(25) =374016a(26) =2989245a(27) =4081505a(28) =5173765a(29) =13017112