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A113869 as a simple table

na(n)
01
1-1
2-1
3-4
4-23
5-171
6-1542
7-16241
8-194973
9-2622610
10-39027573
11-636225591
12-11272598680
13-215668335091
14-4431191311809
15-97316894892644
16-2275184746472827
17-56421527472282127
18-1479397224086870294
19-40897073524132164189
20-1188896226524012279617

[1,-1,-1,-4,-23,-171,-1542,-16241,-194973,
 -2622610,-39027573,-636225591,-11272598680,
 -215668335091,-4431191311809,-97316894892644,
 -2275184746472827,-56421527472282127,
 -1479397224086870294,-40897073524132164189,
 -1188896226524012279617]