a(n) = the least k for which A255326(k) = n; positions of records in A255326.

Terms

a(0) =0a(1) =1a(2) =4a(3) =18a(4) =24a(5) =27a(6) =160a(7) =1470a(8) =1500a(9) =1701a(10) =1920a(11) =2205a(12) =25515a(13) =27951a(14) =392392a(15) =424710a(16) =429000a(17) =481250a(18) =500500a(19) =8824530a(20) =8825856a(21) =185435250a(22) =194922000a(23) =204289085a(24) =214451328