a(n) is the least multiple of n that is a "binary antipalindrome" (i.e., an element of A035928).

Terms

a(0) =2a(1) =2a(2) =12a(3) =12a(4) =10a(5) =12a(6) =42a(7) =56a(8) =558a(9) =10a(10) =682a(11) =12a(12) =52a(13) =42a(14) =150a(15) =240a(16) =170a(17) =558a(18) =38a(19) =240a(20) =42a(21) =682a(22) =598a(23) =240a(24) =150a(25) =52a(26) =3132a(27) =56a(28) =232a(29) =150