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A307911 as a simple table

na(n)
01
1-1
20
327
4-416
55625
6-74304
7924385
8-8626176
9-48361131
107124800000
11-340421390199
1213686496542720
13-522760216822129
1419658830846298112
15-735037915447265625
1627218267709730979840
17-980444996625142158435
1832830565919734078521344
19-889052809376495994642527

[1,-1,0,27,-416,5625,-74304,924385,-8626176,
 -48361131,7124800000,-340421390199,13686496542720,
 -522760216822129,19658830846298112,
 -735037915447265625,27218267709730979840,
 -980444996625142158435,32830565919734078521344,
 -889052809376495994642527]