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A296715 as a simple table

na(n)
01
1-1
2-3
3-20
4-197
5-2511
6-38924
7-708105
8-14769175
9-347328540
10-9093250277
11-262350229095
12-8271756463988
13-283017783855881
14-10445207569804687
15-413662097635230500
16-17499340294430480565
17-787591765696468470799
18-37578217833375886576604

[1,-1,-3,-20,-197,-2511,-38924,-708105,-14769175,
 -347328540,-9093250277,-262350229095,
 -8271756463988,-283017783855881,
 -10445207569804687,-413662097635230500,
 -17499340294430480565,-787591765696468470799,
 -37578217833375886576604]