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A290701 as a simple table

na(n)
22
3-6
46
510
6-30
7-42
8238
9306
10-2790
11-3410
1245606
1353898
14-993902
15-1146810
1627887070
1731605346
18-979901046
19-1095183522
2042166810390
2146605422010
22-2181617832702
23-2389390959626
24133636947954126
25145257552124050
26-9566483624198150
27-10331802314134002

[2,-6,6,10,-30,-42,238,306,-2790,-3410,45606,
 53898,-993902,-1146810,27887070,31605346,
 -979901046,-1095183522,42166810390,46605422010,
 -2181617832702,-2389390959626,133636947954126,
 145257552124050,-9566483624198150,
 -10331802314134002]