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A007313 as a simple table

na(n)
11
2-1
3-3
4-41
5-1035
6-40721
7-2291331
8-174783865
9-17394878523
10-2192620580129
11-341767803858867
12-64587124941406473
13-14555427555355014123
14-3857289820949315456817

[1,-1,-3,-41,-1035,-40721,-2291331,-174783865,
 -17394878523,-2192620580129,-341767803858867,
 -64587124941406473,-14555427555355014123,
 -3857289820949315456817]