a(n) = lcm{1,2,...,n} / swinging_factorial(n) = A003418(n) / A056040(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =3a(7) =3a(8) =12a(9) =4a(10) =10a(11) =10a(12) =30a(13) =30a(14) =105a(15) =7a(16) =56a(17) =56a(18) =252a(19) =252a(20) =1260a(21) =60a(22) =330a(23) =330a(24) =1980a(25) =396a(26) =2574a(27) =286a(28) =2002a(29) =2002