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A038065 as a simple table

na(n)
14
2-10
320
4-60
5204
6-690
72340
8-8160
929120
10-104958
11381300
12-1397740
135162220
14-19175130
1571582716
16-268431360
171010580540
18-3817763040
1914467258260
20-54975528948
21209430785460
22-799645010850
233059510616420

[4,-10,20,-60,204,-690,2340,-8160,29120,-104958,
 381300,-1397740,5162220,-19175130,71582716,
 -268431360,1010580540,-3817763040,14467258260,
 -54975528948,209430785460,-799645010850,
 3059510616420]