a(1) = 2; a(n) - a(n-1) = A093803(a(n-1)), the largest odd proper divisor of a(n-1).

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =9a(6) =12a(7) =15a(8) =20a(9) =25a(10) =30a(11) =45a(12) =60a(13) =75a(14) =100a(15) =125a(16) =150a(17) =225a(18) =300a(19) =375a(20) =500a(21) =625a(22) =750a(23) =1125a(24) =1500a(25) =1875a(26) =2500a(27) =3125a(28) =3750a(29) =5625