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A173559 as a simple table

na(n)
01
1-6
2-13
3-27
4-50
5-106
6-208
7-412
8-840
9-1656
10-3328
11-6672
12-13280
13-26656
14-53248
15-106432
16-213120
17-425856
18-851968
19-1704192
20-3407360
21-6816256
22-13631488
23-27261952
24-54528000
25-109049856
26-218103808
27-436211712
28-872407040
29-1744838656

[1,-6,-13,-27,-50,-106,-208,-412,-840,-1656,-3328,
 -6672,-13280,-26656,-53248,-106432,-213120,
 -425856,-851968,-1704192,-3407360,-6816256,
 -13631488,-27261952,-54528000,-109049856,
 -218103808,-436211712,-872407040,-1744838656]