a(n) = product of those prime(k) such that floor(n/prime(k)) is even.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =3a(7) =6a(8) =2a(9) =5a(10) =5a(11) =30a(12) =30a(13) =105a(14) =7a(15) =14a(16) =14a(17) =21a(18) =21a(19) =210a(20) =10a(21) =55a(22) =55a(23) =330a(24) =66a(25) =429a(26) =143a(27) =2002a(28) =2002a(29) =15015