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A012290 as a simple table

na(n)
00
11
22
30
4-24
5-140
6-8
78960
892736
912240
10-14154208
11-210017280
12-50776704
1358549241920
141133642065792
15435228385280
16-500888609593344
17-11981516394489600
18-6690495105515008
197684815276420464640

[0,1,2,0,-24,-140,-8,8960,92736,12240,-14154208,
 -210017280,-50776704,58549241920,1133642065792,
 435228385280,-500888609593344,-11981516394489600,
 -6690495105515008,7684815276420464640]