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A015695 as a simple table

na(n)
01
1-21
2483
3-12075
4325521
5-9396765
6288749475
7-9398322675
8322652227905
9-11641352627205
10440043353374275
11-17378800976950875
12715361536295492625
13-30625157300600587725
141360947531581394631875
15-62670194480910433291875

[1,-21,483,-12075,325521,-9396765,288749475,
 -9398322675,322652227905,-11641352627205,
 440043353374275,-17378800976950875,
 715361536295492625,-30625157300600587725,
 1360947531581394631875,-62670194480910433291875]