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A012188 as a simple table

na(n)
01
1-2
216
3-272
4256
51758208
6-549115904
7178127730688
8-68157333438464
931349506823815168
10-17274394522483687424
1111298666083444901019648
12-8681212227186028691062784
137756335594110841587790512128

[1,-2,16,-272,256,1758208,-549115904,178127730688,
 -68157333438464,31349506823815168,
 -17274394522483687424,11298666083444901019648,
 -8681212227186028691062784,
 7756335594110841587790512128]