a(n) is the least k such that A213636(k) = n.

Terms

a(0) =1a(1) =2a(2) =48a(3) =24a(4) =180a(5) =300a(6) =17640a(7) =20160a(8) =22680a(9) =25200a(10) =166320a(11) =83160a(12) =4324320a(13) =9369360a(14) =2162160a(15) =7207200a(16) =98017920a(17) =49008960a(18) =2793510720a(19) =2095133040a(20) =1396755360a(21) =698377680