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A159808 as a simple table

na(n)
01
15
2-217
3-3505
4140017
54092925
6-148955945
7-6687706825
8218892836705
914041864596725
10-406539275359865
11-36014008700873825
12902137507503591505
13109095368804855545325
14-2292647754582021148105
15-381078348283760693301625
166416919607713933301113025

[1,5,-217,-3505,140017,4092925,-148955945,
 -6687706825,218892836705,14041864596725,
 -406539275359865,-36014008700873825,
 902137507503591505,109095368804855545325,
 -2292647754582021148105,-381078348283760693301625,
 6416919607713933301113025]