a(n) = numerator(n!/phi(n!)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =3a(4) =15a(5) =15a(6) =35a(7) =35a(8) =35a(9) =35a(10) =77a(11) =77a(12) =1001a(13) =1001a(14) =1001a(15) =1001a(16) =17017a(17) =17017a(18) =323323a(19) =323323a(20) =323323a(21) =323323a(22) =676039a(23) =676039a(24) =676039a(25) =676039a(26) =676039a(27) =676039a(28) =2800733a(29) =2800733