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A137447 as a simple table

na(n)
0-1
1-4
22
312
4-4
5-16
68
748
8-16
9-64
1032
11192
12-64
13-256
14128
15768
16-256
17-1024
18512
193072
20-1024
21-4096
222048
2312288
24-4096
25-16384
268192
2749152
28-16384
29-65536
3032768
31196608
32-65536
33-262144
34131072
35786432
36-262144
37-1048576
38524288
393145728
40-1048576

[-1,-4,2,12,-4,-16,8,48,-16,-64,32,192,-64,-256,
 128,768,-256,-1024,512,3072,-1024,-4096,2048,
 12288,-4096,-16384,8192,49152,-16384,-65536,32768,
 196608,-65536,-262144,131072,786432,-262144,
 -1048576,524288,3145728,-1048576]