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A247482 as a simple table

na(n)
01
11
2-2
31
4-3
5-18
6-124
7-1174
8-12150
9-141536
10-1816780
11-25461723
12-386593670
13-6320496592
14-110711177281
15-2068814967831
16-41089562943757
17-864563028340432
18-19214971769126974
19-449887669808788433
20-11069673481210168218
21-285604488897863640237

[1,1,-2,1,-3,-18,-124,-1174,-12150,-141536,
 -1816780,-25461723,-386593670,-6320496592,
 -110711177281,-2068814967831,-41089562943757,
 -864563028340432,-19214971769126974,
 -449887669808788433,-11069673481210168218,
 -285604488897863640237]