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A292279 as a simple table

na(n)
01
1-1
2-1
3-5
4-15
5-93
6-551
7-4129
8-33607
9-312929
10-3179343
11-35602881
12-432201743
13-5678740945
14-80142780751
15-1210609725905
16-19481112885231
17-332836223507793
18-6016678424942063
19-114746996449871761
20-2302527084416470255
21-48495552665272893329

[1,-1,-1,-5,-15,-93,-551,-4129,-33607,-312929,
 -3179343,-35602881,-432201743,-5678740945,
 -80142780751,-1210609725905,-19481112885231,
 -332836223507793,-6016678424942063,
 -114746996449871761,-2302527084416470255,
 -48495552665272893329]