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A106191 as a simple table

na(n)
01
1-1
2-3
3-7
4-17
5-45
6-129
7-393
8-1251
9-4111
10-13835
11-47427
12-164999
13-581023
14-2066823
15-7415703
16-26805393
17-97520733
18-356810313
19-1312087713
20-4846614093
21-17974854933
22-66907388973
23-249872516253
24-935991743553
25-3515800038201
26-13239692841105

[1,-1,-3,-7,-17,-45,-129,-393,-1251,-4111,-13835,
 -47427,-164999,-581023,-2066823,-7415703,
 -26805393,-97520733,-356810313,-1312087713,
 -4846614093,-17974854933,-66907388973,
 -249872516253,-935991743553,-3515800038201,
 -13239692841105]