a(n) = smallest multiple of 4 with sum of digits = n.

Terms

a(0) =100a(1) =20a(2) =12a(3) =4a(4) =32a(5) =24a(6) =16a(7) =8a(8) =36a(9) =28a(10) =56a(11) =48a(12) =76a(13) =68a(14) =96a(15) =88a(16) =188a(17) =288a(18) =388a(19) =488a(20) =588a(21) =688a(22) =788a(23) =888a(24) =988a(25) =1988a(26) =2988a(27) =3988a(28) =4988a(29) =5988