Smallest k for which A384834(k) = n.

Terms

a(0) =1a(1) =2a(2) =10a(3) =6a(4) =60a(5) =42a(6) =210a(7) =780a(8) =420a(9) =2730a(10) =5460a(11) =3570a(12) =10920a(13) =30030a(14) =94710a(15) =231420a(16) =510510a(17) =190190a(18) =1504230a(19) =2552550a(20) =285285a(21) =15120105a(22) =1141140a(23) =570570a(24) =60480420a(25) =78768690a(26) =380570190a(27) =577642065a(28) =514083570