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A178376 as a simple table

na(n)
01
11
2-2
3-3
4-5
5-28
667
7411
8-506
910855
10-74231
11-664776
127518457
13-30009367
141791756790
1522973709333
16-762305126477
17-10339529833556
18-516074985082229
19-26431010871217485
201057255130388472846

[1,1,-2,-3,-5,-28,67,411,-506,10855,-74231,
 -664776,7518457,-30009367,1791756790,22973709333,
 -762305126477,-10339529833556,-516074985082229,
 -26431010871217485,1057255130388472846]