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A213147 as a simple table

na(n)
01
1-5
2-15
3355
44665
5-88805
6-2984415
737043155
83157381065
9-10240455605
10-4883191732815
11-46188388946045
1210124441425941465
13280075126224969595
14-26112838782751585215
15-1459429976295088887245

[1,-5,-15,355,4665,-88805,-2984415,37043155,
 3157381065,-10240455605,-4883191732815,
 -46188388946045,10124441425941465,
 280075126224969595,-26112838782751585215,
 -1459429976295088887245]