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A038063 as a simple table

na(n)
12
2-3
32
4-3
56
6-11
718
8-30
956
10-105
11186
12-335
13630
14-1179
152182
16-4080
177710
18-14588
1927594
20-52377
2199858
22-190743
23364722
24-698870
251342176
26-2581425
274971008
28-9586395
2918512790
30-35792449
3169273666
32-134215680
33260300986

[2,-3,2,-3,6,-11,18,-30,56,-105,186,-335,630,
 -1179,2182,-4080,7710,-14588,27594,-52377,99858,
 -190743,364722,-698870,1342176,-2581425,4971008,
 -9586395,18512790,-35792449,69273666,-134215680,
 260300986]