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A157817 as a simple table

na(n)
01
1-1
2-1
33
47
5-25
6-31
7427
8127
9-12465
10-2555
11555731
121414477
13-35135945
14-57337
152990414715
16118518239
17-329655706465
18-5749691557
1945692713833379
2091546277357
21-7777794952988025
22-1792042792463
231595024111042171723
241982765468311237
25-387863354088927172625

[1,-1,-1,3,7,-25,-31,427,127,-12465,-2555,555731,
 1414477,-35135945,-57337,2990414715,118518239,
 -329655706465,-5749691557,45692713833379,
 91546277357,-7777794952988025,-1792042792463,
 1595024111042171723,1982765468311237,
 -387863354088927172625]