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A334193 as a simple table

na(n)
01
10
2-2
3-9
4-16
5625
621384
7571438
813471744
9188661555
10-9794500000
11-1476328587789
12-134710712340480
13-10664210861777200
14-744650964057237888
15-37832162051689453125
16831929248561267474432
17725944099523076464203157
18167435684777981700601449984

[1,0,-2,-9,-16,625,21384,571438,13471744,
 188661555,-9794500000,-1476328587789,
 -134710712340480,-10664210861777200,
 -744650964057237888,-37832162051689453125,
 831929248561267474432,725944099523076464203157,
 167435684777981700601449984]