The digitsum of a(n) is the product of the digits of a(n+1).

Terms

a(0) =0a(1) =10a(2) =1a(3) =11a(4) =2a(5) =12a(6) =3a(7) =13a(8) =4a(9) =14a(10) =5a(11) =15a(12) =6a(13) =16a(14) =7a(15) =17a(16) =8a(17) =18a(18) =9a(19) =19a(20) =25a(21) =71a(22) =24a(23) =23a(24) =51a(25) =32a(26) =115a(27) =117a(28) =33a(29) =61