First multiple of n in A025487.

Terms

a(0) =1a(1) =2a(2) =6a(3) =4a(4) =30a(5) =6a(6) =210a(7) =8a(8) =36a(9) =30a(10) =2310a(11) =12a(12) =30030a(13) =210a(14) =30a(15) =16a(16) =510510a(17) =36a(18) =9699690a(19) =60a(20) =210a(21) =2310a(22) =223092870a(23) =24a(24) =900a(25) =30030a(26) =216a(27) =420a(28) =6469693230a(29) =30