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A294494 as a simple table

na(n)
01
1-1
20
3-3
426
5-75
6324
7-3535
830988
9-242025
102245820
11-26847381
12339741984
13-4205748547
1457094691822
15-883946426805
1614358210544304
17-239959114870689
184286519116236900
19-82194727064059645
201650577120959962440
21-34495065863164195611

[1,-1,0,-3,26,-75,324,-3535,30988,-242025,2245820,
 -26847381,339741984,-4205748547,57094691822,
 -883946426805,14358210544304,-239959114870689,
 4286519116236900,-82194727064059645,
 1650577120959962440,-34495065863164195611]