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A351187 as a simple table

na(n)
01
11
21
3-5
425
5-131
6793
7-6137
860049
9-670919
107930321
11-96775853
121225237609
13-16333089227
14232150489129
15-3531321746465
1657178717416097
17-975918663642767
1817400776511175201
19-322309002081819221
206188520430773389881
21-123166171374344928275
222542231599282355411897

[1,1,1,-5,25,-131,793,-6137,60049,-670919,7930321,
 -96775853,1225237609,-16333089227,232150489129,
 -3531321746465,57178717416097,-975918663642767,
 17400776511175201,-322309002081819221,
 6188520430773389881,-123166171374344928275,
 2542231599282355411897]