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A012603 as a simple table

na(n)
01
1-12
2-3248
3-19157952
4-518516045568
5-41950819968248832
6-7989124180734318489600
7-3074627327620950467600302080
8-2150601092109458094146556003287040

[1,-12,-3248,-19157952,-518516045568,
 -41950819968248832,-7989124180734318489600,
 -3074627327620950467600302080,
 -2150601092109458094146556003287040]