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A126984 as a simple table

na(n)
01
1-2
22
3-4
42
5-12
6-12
7-72
8-190
9-700
10-2308
11-8120
12-28364
13-100856
14-360792
15-1301904
16-4727358
17-17268636
18-63405012
19-233885784
20-866327748
21-3220976616
22-12016209192
23-44966763504
24-168750724428
25-634935132312
26-2394717424552
27-9051945482032

[1,-2,2,-4,2,-12,-12,-72,-190,-700,-2308,-8120,
 -28364,-100856,-360792,-1301904,-4727358,
 -17268636,-63405012,-233885784,-866327748,
 -3220976616,-12016209192,-44966763504,
 -168750724428,-634935132312,-2394717424552,
 -9051945482032]