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A159994 as a simple table

na(n)
0-7
1-1219
2-193885217
3-2512095067
4-10152983807749
5-249880575515347
6-2950249420928771944181
7-5129149052857317896107
8-1247467412339070464235923
9-16941291362994850503969493637

[-7,-1219,-193885217,-2512095067,-10152983807749,
 -249880575515347,-2950249420928771944181,
 -5129149052857317896107,
 -1247467412339070464235923,
 -16941291362994850503969493637]