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A159480 as a simple table

na(n)
01
15
2-47
3-955
45377
5301925
6-426095
7-132562075
8-448058495
974115462725
10660919218385
11-50058537070075
12-773740706311295
1339381872496988325
14921130663592313745
15-35091274159002662875
16-1170277487474712158975
1734573760393797506837125

[1,5,-47,-955,5377,301925,-426095,-132562075,
 -448058495,74115462725,660919218385,
 -50058537070075,-773740706311295,
 39381872496988325,921130663592313745,
 -35091274159002662875,-1170277487474712158975,
 34573760393797506837125]