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A352413 as a simple table

na(n)
01
12
2-6
322
4-115
5675
6-4268
728328
8-194664
91372984
10-9882190
1172293094
12-535946436
134017628380
14-30402186474
15231924537486
16-1781685227700
1713771456884192
18-107024198084814
19835752089556270
20-6554617760700801
2151606615762239313

[1,2,-6,22,-115,675,-4268,28328,-194664,1372984,
 -9882190,72293094,-535946436,4017628380,
 -30402186474,231924537486,-1781685227700,
 13771456884192,-107024198084814,835752089556270,
 -6554617760700801,51606615762239313]