a(n) is the least k such that A349281(k) = n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =144a(6) =576a(7) =2880a(8) =14400a(9) =100800a(10) =705600a(11) =6350400a(12) =45158400a(13) =406425600a(14) =3657830400a(15) =40236134400a(16) =442597478400