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A012555 as a simple table

na(n)
02
1-4
2-10
3-1160
425258
5861940
6-503620962
7179232404208
8-65782233424302
927609266214439916
10-13506425126580217786
117702534973614205704808
12-5093447847556265363925254
133877832071517816281261654756

[2,-4,-10,-1160,25258,861940,-503620962,
 179232404208,-65782233424302,27609266214439916,
 -13506425126580217786,7702534973614205704808,
 -5093447847556265363925254,
 3877832071517816281261654756]