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A182827 as a simple table

na(n)
01
1-1
2-1
321
4-111
5-345
614895
7-143955
8-760095
949774095
10-699437025
11-5221460475
12458621111025
13-8457966542025
14-81662774418225
158999266227076125
16-205480756062957375
17-2434383666448358625
18322739182334471277375
19-8786388514658364484875

[1,-1,-1,21,-111,-345,14895,-143955,-760095,
 49774095,-699437025,-5221460475,458621111025,
 -8457966542025,-81662774418225,8999266227076125,
 -205480756062957375,-2434383666448358625,
 322739182334471277375,-8786388514658364484875]