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A012927 as a simple table

na(n)
00
12
2-1
320
4-54
5932
6-5670
799648
8-1005704
919127984
10-273119400
115764554528
12-106046677968
132504052726944
14-55986392252336
151478337150849408
16-38674242587249280
171136792156499528448

[0,2,-1,20,-54,932,-5670,99648,-1005704,19127984,
 -273119400,5764554528,-106046677968,2504052726944,
 -55986392252336,1478337150849408,
 -38674242587249280,1136792156499528448]