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A013567 as a simple table

na(n)
01
10
2-1
39
4-54
5210
6510
7-24500
8355544
9-3310776
107970880
11511460048
12-14772993312
13247420878848
14-2080751146656
15-34093875419760
162085552636479488
17-56037789835944320
18880848150693672192

[1,0,-1,9,-54,210,510,-24500,355544,-3310776,
 7970880,511460048,-14772993312,247420878848,
 -2080751146656,-34093875419760,2085552636479488,
 -56037789835944320,880848150693672192]