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A015684 as a simple table

na(n)
01
1-7
263
3-693
48841
5-127575
62047815
7-36081045
8690863985
9-14263534215
10315469515375
11-7434244696725
12185817177956025
13-4906778826324375
14136422375634920375
15-3981559981797523125
16121659806332798358625

[1,-7,63,-693,8841,-127575,2047815,-36081045,
 690863985,-14263534215,315469515375,
 -7434244696725,185817177956025,-4906778826324375,
 136422375634920375,-3981559981797523125,
 121659806332798358625]