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A339516 as a simple table

na(n)
11
21
3-3
4-35
5-287
6-2655
7-29315
8-381251
9-5718975
10-97222847
11-1847234435
12-38791923555
13-892214242271
14-22305356057375
15-602244613549827
16-17465093792945795
17-541417907581320575
18-17866790950183580031
19-625337683256425302275
20-23137494280487736185507

[1,1,-3,-35,-287,-2655,-29315,-381251,-5718975,
 -97222847,-1847234435,-38791923555,-892214242271,
 -22305356057375,-602244613549827,
 -17465093792945795,-541417907581320575,
 -17866790950183580031,-625337683256425302275,
 -23137494280487736185507]