Smallest m such that A001221(A001159(m)) = n.

Terms

a(0) =2a(1) =3a(2) =4a(3) =16a(4) =12a(5) =60a(6) =96a(7) =294a(8) =720a(9) =1936a(10) =3920a(11) =9680a(12) =33712a(13) =83248a(14) =303408a(15) =1517040a(16) =5207472a(17) =26972352a(18) =74469808a(19) =255166128