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A012391 as a simple table

na(n)
00
12
216
3152
4-5504
5-865888
6-49313024
710192998272
84634262163456
9729893872005632
10-280859292338008064
11-286057930617679095808
12-94104910901654903619584
1351677977224364973979901952

[0,2,16,152,-5504,-865888,-49313024,10192998272,
 4634262163456,729893872005632,-280859292338008064,
 -286057930617679095808,-94104910901654903619584,
 51677977224364973979901952]