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A118405 as a simple table

na(n)
01
10
20
3-2
44
5-6
612
7-26
852
9-102
10204
11-410
12820
13-1638
143276
15-6554
1613108
17-26214
1852428
19-104858
20209716
21-419430
22838860
23-1677722
243355444
25-6710886
2613421772
27-26843546
2853687092
29-107374182
30214748364
31-429496730
32858993460
33-1717986918
343435973836
35-6871947674

[1,0,0,-2,4,-6,12,-26,52,-102,204,-410,820,-1638,
 3276,-6554,13108,-26214,52428,-104858,209716,
 -419430,838860,-1677722,3355444,-6710886,13421772,
 -26843546,53687092,-107374182,214748364,
 -429496730,858993460,-1717986918,3435973836,
 -6871947674]