Arithmetic derivatives of 3-smooth numbers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =4a(4) =5a(5) =12a(6) =6a(7) =16a(8) =32a(9) =21a(10) =44a(11) =27a(12) =80a(13) =60a(14) =112a(15) =81a(16) =192a(17) =156a(18) =108a(19) =272a(20) =216a(21) =448a(22) =384a(23) =297a(24) =640a(25) =540a(26) =405a(27) =1024a(28) =912a(29) =756