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A091699 as a simple table

na(n)
01
10
2-1
33
4-9
530
6-109
7420
8-1685
96960
10-29391
11126291
12-550359
132426502
14-10803801
1548507843
16-219377949
17998436792
18-4569488371
1921016589073
20-97090411019
21450314942682
22-2096122733211
239788916220518

[1,0,-1,3,-9,30,-109,420,-1685,6960,-29391,126291,
 -550359,2426502,-10803801,48507843,-219377949,
 998436792,-4569488371,21016589073,-97090411019,
 450314942682,-2096122733211,9788916220518]