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A009123 as a simple table

na(n)
01
10
21
3-3
48
5-30
6136
7-693
83968
9-25260
10176896
11-1351383
1211184128
13-99680490
14951878656
15-9695756073
16104932671488
17-1202439837720
1814544442556416
19-185185594118763
202475749026562048
21-34674437196568950

[1,0,1,-3,8,-30,136,-693,3968,-25260,176896,
 -1351383,11184128,-99680490,951878656,-9695756073,
 104932671488,-1202439837720,14544442556416,
 -185185594118763,2475749026562048,
 -34674437196568950]