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A226302 as a simple table

na(n)
21
3-1
42
5-4
66
7-14
820
9-48
1070
11-166
12252
13-584
14924
15-2092
163432
17-7616
1812870
19-28102
2048620
21-104824
22184756
23-394404
24705432
25-1494240
262704156
27-5692636
2810400600
29-21785872
3040116600
31-83688344
32155117520
33-322494208
34601080390
35-1246068806
362333606220

[1,-1,2,-4,6,-14,20,-48,70,-166,252,-584,924,
 -2092,3432,-7616,12870,-28102,48620,-104824,
 184756,-394404,705432,-1494240,2704156,-5692636,
 10400600,-21785872,40116600,-83688344,155117520,
 -322494208,601080390,-1246068806,2333606220]