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A012450 as a simple table

na(n)
12
20
340
4-2688
5210208
6-13038080
72241915520
8-589026013184
9146361182839296
10-42690102749216768
1118963982821764573184
12-10109322351828827471872
135702647873782168851521536

[2,0,40,-2688,210208,-13038080,2241915520,
 -589026013184,146361182839296,-42690102749216768,
 18963982821764573184,-10109322351828827471872,
 5702647873782168851521536]