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A002742 as a simple table

na(n)
12
2-6
324
4-80
5450
6-2142
717696
8-112464
91232370
10-9761510
11132951192
12-1258797696
1320476388114
14-225380451870
154261074439680
16-53438049741152
171151146814425506
18-16199301256675974
19391615698778725080
20-6109914386833902960

[2,-6,24,-80,450,-2142,17696,-112464,1232370,
 -9761510,132951192,-1258797696,20476388114,
 -225380451870,4261074439680,-53438049741152,
 1151146814425506,-16199301256675974,
 391615698778725080,-6109914386833902960]