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A003725 as a simple table

na(n)
01
11
2-1
3-2
49
5-4
6-95
7414
849
9-10088
1055521
11-13870
12-2024759
1315787188
14-28612415
15-616876274
167476967905
17-32522642896
18-209513308607
194924388011050
20-38993940088199
2111731860520780
223807154270837281

[1,1,-1,-2,9,-4,-95,414,49,-10088,55521,-13870,
 -2024759,15787188,-28612415,-616876274,7476967905,
 -32522642896,-209513308607,4924388011050,
 -38993940088199,11731860520780,3807154270837281]