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A337749 as a simple table

na(n)
01
11
2-1
3-5
413
5101
6-389
7-4241
821785
9305353
10-1960649
11-33588829
12258805669
135239857325
14-47102631757
15-1100370038249
1611304631621681
17299300650403729
18-3459217276234385
19-102360822438075317
201314502564969066301
2142991545423991633141
22-607300185015708631061

[1,1,-1,-5,13,101,-389,-4241,21785,305353,
 -1960649,-33588829,258805669,5239857325,
 -47102631757,-1100370038249,11304631621681,
 299300650403729,-3459217276234385,
 -102360822438075317,1314502564969066301,
 42991545423991633141,-607300185015708631061]