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A012304 as a simple table

na(n)
01
10
22
3-3
424
5-100
6808
7-5439
851800
9-469008
105292162
11-59508075
12782885532
13-10464052248
14157781733198
15-2437533390915
1641504137389648
17-726658147836384
1813799849799221682
19-269818493378847219

[1,0,2,-3,24,-100,808,-5439,51800,-469008,5292162,
 -59508075,782885532,-10464052248,157781733198,
 -2437533390915,41504137389648,-726658147836384,
 13799849799221682,-269818493378847219]