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A328380 as a simple table

na(n)
01
11
21
31
4-1
5-3
6-5
7-13
811
9131
10389
112311
129
13-81511
14-484247
15-5751815
16-17124617
17710017141
189644648819
19204006839259
202405317965859
21-84560118880501
22-2988387877551859
23-105333970856330737
24-3722531175803860975
25130866937507290027313

[1,1,1,1,-1,-3,-5,-13,11,131,389,2311,9,-81511,
 -484247,-5751815,-17124617,710017141,9644648819,
 204006839259,2405317965859,-84560118880501,
 -2988387877551859,-105333970856330737,
 -3722531175803860975,130866937507290027313]