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A336728 as a simple table

na(n)
01
11
2-1
31
49
5-174
62575
7-38219
8588833
9-9274418
10141253551
11-1739881142
12-753419447
131379742127908
14-83720072007585
154059017293956301
16-184613801568558975
178254420480122200214
18-369177108304219471457
1916608406418618863804990
20-750673988803431836351799

[1,1,-1,1,9,-174,2575,-38219,588833,-9274418,
 141253551,-1739881142,-753419447,1379742127908,
 -83720072007585,4059017293956301,
 -184613801568558975,8254420480122200214,
 -369177108304219471457,16608406418618863804990,
 -750673988803431836351799]