a(n) = A001783(n)/A038610(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =12a(7) =1a(8) =8a(9) =3a(10) =1440a(11) =1a(12) =17280a(13) =3a(14) =112a(15) =45a(16) =29030400a(17) =1a(18) =522547200a(19) =3a(20) =12800a(21) =945a(23) =1a(24) =38626689024a(25) =4725a(26) =512512000a(27) =2025a(29) =1a(31) =42525a(32) =10436608000