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A002020 as a simple table

na(n)
01
11
21
31
4-5
5-17
683
7593
8-2893
9-36101
10172195
113421285
12-15520165
13-467129785
141954015955
1586971636825
16-323371713725
17-21196564551725
1866760541581475
196552909294409325
20-16279195926455125
21-2506384727801998625
224330877561309153875

[1,1,1,1,-5,-17,83,593,-2893,-36101,172195,
 3421285,-15520165,-467129785,1954015955,
 86971636825,-323371713725,-21196564551725,
 66760541581475,6552909294409325,
 -16279195926455125,-2506384727801998625,
 4330877561309153875]