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A261254 as a simple table

na(n)
01
1-4
22
3-4
4-21
5-136
6-996
7-8152
8-73811
9-733244
10-7938186
11-93126716
12-1178054657
13-15998857056
14-232339375664
15-3594982133808
16-59070662442383
17-1027605845674036
18-18873206761567638
19-365015243426704372
20-7416392564276075453
21-157957992952546414328

[1,-4,2,-4,-21,-136,-996,-8152,-73811,-733244,
 -7938186,-93126716,-1178054657,-15998857056,
 -232339375664,-3594982133808,-59070662442383,
 -1027605845674036,-18873206761567638,
 -365015243426704372,-7416392564276075453,
 -157957992952546414328]