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A294356 as a simple table

na(n)
01
1-1
21
3-5
423
5-119
6619
7-4759
848145
9-476657
104249961
11-48286061
12691331431
13-9132207655
14117900772963
15-2025161870159
1637607411624609
17-628236985455329
1810768798391659345
19-215626810984559317
204751529623277906871
21-105427459848063440471

[1,-1,1,-5,23,-119,619,-4759,48145,-476657,
 4249961,-48286061,691331431,-9132207655,
 117900772963,-2025161870159,37607411624609,
 -628236985455329,10768798391659345,
 -215626810984559317,4751529623277906871,
 -105427459848063440471]