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A015691 as a simple table

na(n)
01
1-15
2255
3-4845
4101385
5-2309535
656759175
7-1494125325
841881856625
9-1244022735375
1038993819043375
11-1285240980610125
1244407270217165625
13-1604088315616161375
1460431927134988784375
15-2369411881012489438125

[1,-15,255,-4845,101385,-2309535,56759175,
 -1494125325,41881856625,-1244022735375,
 38993819043375,-1285240980610125,
 44407270217165625,-1604088315616161375,
 60431927134988784375,-2369411881012489438125]