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A013380 as a simple table

na(n)
01
1-15
2271
3-8215
4423091
5-35126715
64192844111
7-652228720015
8125163350892331
9-28804173376146115
107819440342923915751
11-2475114876516159269015
12904874211609774006906371
13-378873316356391869172808715
14180284311084647508248207800191
15-96800336889159425029828580541215

[1,-15,271,-8215,423091,-35126715,4192844111,
 -652228720015,125163350892331,-28804173376146115,
 7819440342923915751,-2475114876516159269015,
 904874211609774006906371,
 -378873316356391869172808715,
 180284311084647508248207800191,
 -96800336889159425029828580541215]