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A014989 as a simple table

na(n)
11
2-6
343
4-300
52101
6-14706
7102943
8-720600
95044201
10-35309406
11247165843
12-1730160900
1312111126301
14-84777884106
15593445188743
16-4154116321200
1729078814248401
18-203551699738806
191424861898171643
20-9974033287201500

[1,-6,43,-300,2101,-14706,102943,-720600,5044201,
 -35309406,247165843,-1730160900,12111126301,
 -84777884106,593445188743,-4154116321200,
 29078814248401,-203551699738806,1424861898171643,
 -9974033287201500]