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A213150 as a simple table

na(n)
01
1-7
2-7
3777
43129
5-342615
6-2965095
7318612105
84810567545
9-504410403735
10-11895756971175
111209591806193225
1241613411780711225
13-4074816146460117975
14-195459943548067129575
1518284823353530418351625

[1,-7,-7,777,3129,-342615,-2965095,318612105,
 4810567545,-504410403735,-11895756971175,
 1209591806193225,41613411780711225,
 -4074816146460117975,-195459943548067129575,
 18284823353530418351625]