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A159840 as a simple table

na(n)
01
115
2-17
3-7515
4-100383
55768775
6207995055
7-5256335475
8-431188655295
93708435650175
10994755425985135
115946917116353525
12-2558835187227126495
13-55652375114297534025
147215309872302076942895
15296779894971771199420125
16-21739876411879971311406975

[1,15,-17,-7515,-100383,5768775,207995055,
 -5256335475,-431188655295,3708435650175,
 994755425985135,5946917116353525,
 -2558835187227126495,-55652375114297534025,
 7215309872302076942895,296779894971771199420125,
 -21739876411879971311406975]