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A012676 as a simple table

na(n)
01
12
2-4
3-40
42704
5-135392
66955456
7-305645184
8-7730286336
97469091807744
10-2423718751585280
11765682386623223808
12-278356000956737810432
13126892576689335471251456

[1,2,-4,-40,2704,-135392,6955456,-305645184,
 -7730286336,7469091807744,-2423718751585280,
 765682386623223808,-278356000956737810432,
 126892576689335471251456]