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A170922 as a simple table

na(n)
11
2-1
31
4-13
53
6-37
79
8-1861
97
10-1491
1193
12-81001
13315
14-69705
151083
16-63586357
173855
18-438821
1913797
20-822684711
2149689
22-186369117
23182361
24-704368012465
2510485
26-10165801275
27619549
28-9738266477517
299256395
30-566066862375
3134636833
32-140047960975823893

[1,-1,1,-13,3,-37,9,-1861,7,-1491,93,-81001,315,
 -69705,1083,-63586357,3855,-438821,13797,
 -822684711,49689,-186369117,182361,-704368012465,
 10485,-10165801275,619549,-9738266477517,9256395,
 -566066862375,34636833,-140047960975823893]