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A321821 as a simple table

na(n)
11
21
3-242
41
53126
6-242
7-16806
81
958807
103126
11-161050
12-242
13371294
14-16806
15-756492
161
171419858
1858807
19-2476098
203126
214067052
22-161050
23-6436342
24-242
259768751
26371294
27-14290100
28-16806
2920511150
30-756492
31-28629150
321
3338974100

[1,1,-242,1,3126,-242,-16806,1,58807,3126,-161050,
 -242,371294,-16806,-756492,1,1419858,58807,
 -2476098,3126,4067052,-161050,-6436342,-242,
 9768751,371294,-14290100,-16806,20511150,-756492,
 -28629150,1,38974100]