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A141342 as a simple table

na(n)
01
11
2-1
33
4-13
565
6-353
72025
8-12077
974143
10-465481
112974863
12-19289821
13126594191
14-839273105
155612483619
16-37814455781
17256447068841
18-1749182184793
1911991887667273
20-82588248514885
21571118483653841

[1,1,-1,3,-13,65,-353,2025,-12077,74143,-465481,
 2974863,-19289821,126594191,-839273105,5612483619,
 -37814455781,256447068841,-1749182184793,
 11991887667273,-82588248514885,571118483653841]