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A276998 as a simple table

na(n)
01
11
22
31
412
56
6-1
772
824
9-24
101
111440
12120
13-960
14200
1537
1643200
17-9360
18-44280
1920640
203750
21-1493
221814400
23-997920
24-2484720
252028600
26271740
27-378966
2814017
2925401600
30-23042880
31-42497280
3254159840
333328080
34-18236064
351977248
36751267

[1,1,2,1,12,6,-1,72,24,-24,1,1440,120,-960,200,37,
 43200,-9360,-44280,20640,3750,-1493,1814400,
 -997920,-2484720,2028600,271740,-378966,14017,
 25401600,-23042880,-42497280,54159840,3328080,
 -18236064,1977248,751267]