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A290533 as a simple table

na(n)
00
11
2-2
31
4-12
525
6-1382
7245
8-28936
9131601
10-2444554
119399643
12-4727281820
131000713051
14-332492454406
1543079206380025
16-1356840503254192
171533724275728365
18-157891629318320864238
19723708496718865073
20-1044330873985796488204

[0,1,-2,1,-12,25,-1382,245,-28936,131601,-2444554,
 9399643,-4727281820,1000713051,-332492454406,
 43079206380025,-1356840503254192,1533724275728365,
 -157891629318320864238,723708496718865073,
 -1044330873985796488204]