a(n) is the smallest integer k such that A384237(k) = n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =66a(5) =30a(6) =210a(7) =390a(8) =1365a(9) =2310a(10) =3990a(11) =10920a(12) =2730a(13) =84630a(14) =53130a(15) =87780a(16) =114114a(17) =760760a(18) =2042040a(19) =1345890a(20) =285285a(21) =1902810a(22) =570570a(23) =1141140a(24) =25571910a(25) =30240210a(26) =2282280a(27) =358888530a(28) =514083570a(29) =413092680