Product of primes which do not exceed n and do not divide the swinging factorial n$ (A056040).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =3a(8) =3a(9) =1a(10) =5a(11) =5a(12) =5a(13) =5a(14) =35a(15) =7a(16) =7a(17) =7a(18) =21a(19) =21a(20) =105a(21) =5a(22) =55a(23) =55a(24) =165a(25) =33a(26) =429a(27) =143a(28) =1001a(29) =1001