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A321825 as a simple table

na(n)
11
21
3-19682
41
51953126
6-19682
7-40353606
81
9387400807
101953126
11-2357947690
12-19682
1310604499374
14-40353606
15-38441425932
161
17118587876498
18387400807
19-322687697778
201953126
21794239673292
22-2357947690
23-1801152661462
24-19682
253814699218751

[1,1,-19682,1,1953126,-19682,-40353606,1,
 387400807,1953126,-2357947690,-19682,10604499374,
 -40353606,-38441425932,1,118587876498,387400807,
 -322687697778,1953126,794239673292,-2357947690,
 -1801152661462,-19682,3814699218751]