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A320677 as a simple table

na(n)
01
1-18
2135
3-504
4657
52052
6-10071
712384
820277
9-83610
1072090
11122040
12-355581
13245124
14379512
15-1050624
16770589
17966492
18-2700081
191724616
202287062
21-5636880
223616164
234471632
24-11385657
256820722
268554194
27-19963440
2812302568
2914113332
30-34631226
3119737936

[1,-18,135,-504,657,2052,-10071,12384,20277,
 -83610,72090,122040,-355581,245124,379512,
 -1050624,770589,966492,-2700081,1724616,2287062,
 -5636880,3616164,4471632,-11385657,6820722,
 8554194,-19963440,12302568,14113332,-34631226,
 19737936]