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A321548 as a simple table

na(n)
11
2-511
319684
4-262655
51953126
6-10058524
740353608
8-134480383
9387440173
10-998047386
112357947692
12-5170101020
1310604499374
14-20620693688
1538445332184
16-68853957119
17118587876498
18-197981928403
19322687697780
20-512998309530
21794320419872
22-1204911270612
231801152661464
24-2647111858972

[1,-511,19684,-262655,1953126,-10058524,40353608,
 -134480383,387440173,-998047386,2357947692,
 -5170101020,10604499374,-20620693688,38445332184,
 -68853957119,118587876498,-197981928403,
 322687697780,-512998309530,794320419872,
 -1204911270612,1801152661464,-2647111858972]