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A294341 as a simple table

na(n)
01
1-1
20
32
4-2
518
6-128
7740
8-3204
9-6076
10210304
11-1097064
12-29284760
13398231768
14792490752
15-124480674448
161471405254928
17-2684728872720
18-64686947480576
19-626709774748384
20-10524779012515104
21689522178752789024
2234910956277827256320

[1,-1,0,2,-2,18,-128,740,-3204,-6076,210304,
 -1097064,-29284760,398231768,792490752,
 -124480674448,1471405254928,-2684728872720,
 -64686947480576,-626709774748384,
 -10524779012515104,689522178752789024,
 34910956277827256320]