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A350407 as a simple table

na(n)
01
1-1
21
3-1
41
54
6-35
7146
8-447
91133
10-2464
114355
12-4355
13-9296
1477078
15-314636
161006145
17-2738565
186398155
19-12175809
2014621376
2114828330
22-179236815
23786257460
24-2625667395
257412386254
26-17983703880
2736057065030
28-49553122730
29-14585596720

[1,-1,1,-1,1,4,-35,146,-447,1133,-2464,4355,-4355,
 -9296,77078,-314636,1006145,-2738565,6398155,
 -12175809,14621376,14828330,-179236815,786257460,
 -2625667395,7412386254,-17983703880,36057065030,
 -49553122730,-14585596720]