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A303397 as a simple table

na(n)
01
1-4
24
3-4
420
5-36
652
7-116
8244
9-500
10964
11-1876
123876
13-7780
1415332
15-30628
1661684
17-123460
18246036
19-491988
20985492
21-1971284
223939556
23-7878068
2415762692
25-31527428
2663041220
27-126078916
28252185044
29-504375460
301008698036
31-2017385268
324034873268

[1,-4,4,-4,20,-36,52,-116,244,-500,964,-1876,3876,
 -7780,15332,-30628,61684,-123460,246036,-491988,
 985492,-1971284,3939556,-7878068,15762692,
 -31527428,63041220,-126078916,252185044,
 -504375460,1008698036,-2017385268,4034873268]