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A012423 as a simple table

na(n)
00
12
2-12
3-50
412936
5-643142
6-60323780
722895524678
8-2421315237488
9-864760878344718
10527455288321939204
11-55917569000158790850
12-108932420480580224669416
1383957330220575698201816746

[0,2,-12,-50,12936,-643142,-60323780,22895524678,
 -2421315237488,-864760878344718,
 527455288321939204,-55917569000158790850,
 -108932420480580224669416,
 83957330220575698201816746]