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A004984 as a simple table

na(n)
01
1-2
2-6
3-28
4-154
5-924
6-5852
7-38456
8-259578
9-1788204
10-12517428
11-88759944
12-636112932
13-4599585816
14-33511268088
15-245749299312
16-1812401082426
17-13433090375628
18-100001895018564
19-747382583822952
20-5605369378672140
21-42173731515723720

[1,-2,-6,-28,-154,-924,-5852,-38456,-259578,
 -1788204,-12517428,-88759944,-636112932,
 -4599585816,-33511268088,-245749299312,
 -1812401082426,-13433090375628,-100001895018564,
 -747382583822952,-5605369378672140,
 -42173731515723720]