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A012806 as a simple table

na(n)
01
1-1
2-3
3-165
41337
5-356745
631874997
7-5714452653
81296863374193
9-357091592679441
10131690816886952045
11-56304582100478416309
1229876409015019700748969
13-18379375710670502969514905

[1,-1,-3,-165,1337,-356745,31874997,-5714452653,
 1296863374193,-357091592679441,131690816886952045,
 -56304582100478416309,29876409015019700748969,
 -18379375710670502969514905]