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A159530 as a simple table

na(n)
01
14
2-562
3-6872
4947020
519676144
6-2658183224
7-78869600288
810439530923152
9406451155424320
10-52680635240539424
11-2560010219314727296
12324703437982090748608
1319055044633095311519488
14-2363601454465048638962560
15-163647826988867455371547136

[1,4,-562,-6872,947020,19676144,-2658183224,
 -78869600288,10439530923152,406451155424320,
 -52680635240539424,-2560010219314727296,
 324703437982090748608,19055044633095311519488,
 -2363601454465048638962560,
 -163647826988867455371547136]