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A339513 as a simple table

na(n)
11
20
3-1
43
5-2
6-45
7347
8-756
9-13031
10184245
11-810034
12-11404503
13264733177
14-1931955480
15-21453955777
16796153961091
17-8688345850874
18-69492467459925
194300450718587619
20-65896562313762012
21-307002797419794407
2237668399518087366325

[1,0,-1,3,-2,-45,347,-756,-13031,184245,-810034,
 -11404503,264733177,-1931955480,-21453955777,
 796153961091,-8688345850874,-69492467459925,
 4300450718587619,-65896562313762012,
 -307002797419794407,37668399518087366325]