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A305475 as a simple table

na(n)
10
2-1728
33375
4-8000
532768
6-54000
7-121287375
8-287496
9884736
10-681472000
1112771880859375
1214670139392
1312288000
14-16581375
151566028350940383
1612167000000
17-134217728000
18-1790957481984
1920919104368024767633
209103145472000
21884736000

[0,-1728,3375,-8000,32768,-54000,-121287375,
 -287496,884736,-681472000,12771880859375,
 14670139392,12288000,-16581375,1566028350940383,
 12167000000,-134217728000,-1790957481984,
 20919104368024767633,9103145472000,884736000]