a(1)=1; a(n) = a(n-1) + [sum of all decimal digits present so far in the sequence].

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =25a(5) =44a(6) =71a(7) =106a(8) =148a(9) =203a(10) =263a(11) =334a(12) =415a(13) =506a(14) =608a(15) =724a(16) =853a(17) =998a(18) =1169a(19) =1357a(20) =1561a(21) =1778a(22) =2018a(23) =2269a(24) =2539a(25) =2828a(26) =3137a(27) =3460a(28) =3796a(29) =4157