a(1)=1; for n >= 1, a(n+1) = lcm(a(n),n) / gcd(a(n),n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =6a(5) =30a(6) =5a(7) =35a(8) =280a(9) =2520a(10) =252a(11) =2772a(12) =231a(13) =3003a(14) =858a(15) =1430a(16) =5720a(17) =97240a(18) =437580a(19) =8314020a(20) =415701a(21) =969969a(22) =176358a(23) =4056234a(24) =2704156a(25) =67603900a(26) =2600150a(27) =70204050a(28) =10029150a(29) =290845350