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A303490 as a simple table

na(n)
01
1-2
20
3-10
422
5-102
684
7-950
83360
9-18006
1021968
11-162126
12613830
13-2772010
143847740
15-38669210
16145735622
17-567469350
18901506480
19-6688787966
2027166965906
21-137118406226
22234942672620
23-1425038557410
246527750118052
25-27227710098826

[1,-2,0,-10,22,-102,84,-950,3360,-18006,21968,
 -162126,613830,-2772010,3847740,-38669210,
 145735622,-567469350,901506480,-6688787966,
 27166965906,-137118406226,234942672620,
 -1425038557410,6527750118052,-27227710098826]