a(n) = Primorial(n) / Product_{k prime<n} k.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =35a(5) =385a(6) =1001a(7) =17017a(8) =46189a(9) =1062347a(10) =30808063a(11) =955049953a(12) =3212440751a(13) =131710070791a(14) =435656388001