Murai Chuzen numbers.

Terms

a(0) =9a(1) =45a(2) =3a(3) =225a(4) =18a(5) =15a(6) =-1a(7) =1125a(8) =1a(9) =99a(10) =495a(11) =33a(12) =2475a(13) =198a(14) =165a(15) =-1a(16) =12375a(17) =11a(18) =999a(19) =4995a(20) =333a(21) =24975a(22) =1998a(23) =1665a(24) =-1a(25) =124875a(26) =111a(27) =9999a(28) =49995a(29) =3333