a(n) = A084190(A084190(n)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =36a(6) =10a(7) =60a(8) =21a(9) =157080a(10) =36a(12) =330a(13) =438900a(14) =702a(15) =185640a(16) =105a(18) =680a(20) =450574740a(22) =210