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A012820 as a simple table

na(n)
01
1-1
2-11
3-37
47145
5450711
6-3070179
7-4923539597
8-586954253103
957287087552943
1041119408518068293
115965331366096594059
12-2749345524263504663367
13-1905635088547220040309433

[1,-1,-11,-37,7145,450711,-3070179,-4923539597,
 -586954253103,57287087552943,41119408518068293,
 5965331366096594059,-2749345524263504663367,
 -1905635088547220040309433]