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A156219 as a simple table

na(n)
01
1-5
2-14
3545
41330
5-45125
6-325934
762271385
8149716210
9-9199961075
10-110578403054
1116611095045315
12119791661123890
13-10633558277471225
14-178929901418355374
15146613250885940140025
16352435300540743552370
17-40910747987067422049575

[1,-5,-14,545,1330,-45125,-325934,62271385,
 149716210,-9199961075,-110578403054,
 16611095045315,119791661123890,-10633558277471225,
 -178929901418355374,146613250885940140025,
 352435300540743552370,-40910747987067422049575]