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A161743 as a simple table

na(n)
31
410
573
6425
71561
8-2856
9-73520
10380160
1115376416
12-117209664
13-7506967104
1472162155520
157045087741056
16-80246202992640
17-11448278791372800
18149576169325363200
1930017051616972275712
20-440857664887810867200

[1,10,73,425,1561,-2856,-73520,380160,15376416,
 -117209664,-7506967104,72162155520,7045087741056,
 -80246202992640,-11448278791372800,
 149576169325363200,30017051616972275712,
 -440857664887810867200]