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A013397 as a simple table

na(n)
01
10
21
3-1
49
5-25
6235
7-1125
812145
9-83305
101037475
11-9280225
12132009625
13-1456021125
1423378099875
15-306453818125
165493040502625
17-83388492864625
181652566180607875
19-28500730684349625
20619275939126495625

[1,0,1,-1,9,-25,235,-1125,12145,-83305,1037475,
 -9280225,132009625,-1456021125,23378099875,
 -306453818125,5493040502625,-83388492864625,
 1652566180607875,-28500730684349625,
 619275939126495625]