a(n)=a(n-1)+sum of digits(a(n-1))*sum of digits(a(n-2)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =24a(6) =42a(7) =78a(8) =168a(9) =393a(10) =618a(11) =843a(12) =1068a(13) =1293a(14) =1518a(15) =1743a(16) =1968a(17) =2328a(18) =2688a(19) =3048a(20) =3408a(21) =3633a(22) =3858a(23) =4218a(24) =4578a(25) =4938a(26) =5514a(27) =5874a(28) =6234a(29) =6594