a(n) = Product_{d|n} Product_{d_x|n , d_x <= d} d_x.

Terms

a(0) =1a(1) =2a(2) =3a(3) =16a(4) =5a(5) =432a(6) =7a(7) =1024a(8) =81a(9) =2000a(10) =11a(11) =71663616a(12) =13a(13) =5488a(14) =10125a(15) =1048576a(16) =17a(17) =816293376a(18) =19a(19) =2048000000a(20) =27783a(21) =21296a(22) =23a(24) =625a(25) =35152a(26) =59049a(27) =15420489728a(28) =29a(30) =31a(31) =34359738368