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A321826 as a simple table

na(n)
11
21
3-59048
41
59765626
6-59048
7-282475248
81
93486725353
109765626
11-25937424600
12-59048
13137858491850
14-282475248
15-576640684048
161
172015993900450
183486725353
19-6131066257800
209765626
2116679598443904
22-25937424600
23-41426511213648
24-59048
2595367441406251
26137858491850

[1,1,-59048,1,9765626,-59048,-282475248,1,
 3486725353,9765626,-25937424600,-59048,
 137858491850,-282475248,-576640684048,1,
 2015993900450,3486725353,-6131066257800,9765626,
 16679598443904,-25937424600,-41426511213648,
 -59048,95367441406251,137858491850]