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A013171 as a simple table

na(n)
02
1-5
2-55
3-1535
4-80695
5-6860075
6-859242475
7-148907237375
8-34123911391375
9-9992873727945875
10-3640782796679981875
11-1615246696514236394375
12-857352190238672679484375

[2,-5,-55,-1535,-80695,-6860075,-859242475,
 -148907237375,-34123911391375,-9992873727945875,
 -3640782796679981875,-1615246696514236394375,
 -857352190238672679484375]