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A326484 as a simple table

na(n)
01
1-6
228
3-72
4-176
51824
611968
7-177792
8-1062656
925864704
10155204608
11-5535270912
12-33211559936
131633165123584
149798991003648
15-635421070098432
16-3812526419542016
17315212388818878464
181891274332917465088
19-194181169538677604352
20-1165087017232048848896

[1,-6,28,-72,-176,1824,11968,-177792,-1062656,
 25864704,155204608,-5535270912,-33211559936,
 1633165123584,9798991003648,-635421070098432,
 -3812526419542016,315212388818878464,
 1891274332917465088,-194181169538677604352,
 -1165087017232048848896]