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A295239 as a simple table

na(n)
01
1-1
22
3-9
468
5-705
69234
7-146209
82717000
9-57986433
101397949830
11-37576332321
121114326129564
13-36141571087297
141272713716466906
15-48360394499269665
161972269941821097744
17-85929979225787811585
183983422470176606823054
19-195765982110500512129057

[1,-1,2,-9,68,-705,9234,-146209,2717000,-57986433,
 1397949830,-37576332321,1114326129564,
 -36141571087297,1272713716466906,
 -48360394499269665,1972269941821097744,
 -85929979225787811585,3983422470176606823054,
 -195765982110500512129057]