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A038069 as a simple table

na(n)
14
2-6
320
4-66
5204
6-670
72340
8-8226
929120
10-104754
11381300
12-1398410
135162220
14-19172790
1571582716
16-268439586
171010580540
18-3817733920
1914467258260
20-54975633702
21209430785460
22-799644629550
233059510616420

[4,-6,20,-66,204,-670,2340,-8226,29120,-104754,
 381300,-1398410,5162220,-19172790,71582716,
 -268439586,1010580540,-3817733920,14467258260,
 -54975633702,209430785460,-799644629550,
 3059510616420]