Least common multiple of {d-1: d > 1 and d divides n}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =10a(6) =6a(7) =21a(8) =8a(9) =36a(10) =10a(11) =330a(12) =12a(13) =78a(14) =28a(15) =105a(16) =16a(17) =680a(18) =18a(19) =684a(20) =60a(21) =210a(22) =22a(23) =53130a(24) =24a(25) =300a(26) =104a(27) =702a(28) =28a(29) =36540