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A217854 as a simple table

na(n)
1-1
24
39
4-64
525
61296
749
84096
9-729
1010000
11121
122985984
13169
1438416
1550625
16-1048576
17289
1834012224
19361
2064000000
21194481
22234256
23529
24110075314176
25-15625
26456976
27531441
28481890304
29841
30656100000000
31961
321073741824
331185921

[-1,4,9,-64,25,1296,49,4096,-729,10000,121,
 2985984,169,38416,50625,-1048576,289,34012224,361,
 64000000,194481,234256,529,110075314176,-15625,
 456976,531441,481890304,841,656100000000,961,
 1073741824,1185921]