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A104538 as a simple table

na(n)
01
10
2-4
38
40
5-32
664
70
8-256
9512
100
11-2048
124096
130
14-16384
1532768
160
17-131072
18262144
190
20-1048576
212097152
220
23-8388608
2416777216
250
26-67108864
27134217728
280
29-536870912
301073741824
310
32-4294967296
338589934592
340
35-34359738368
3668719476736
370
38-274877906944
39549755813888
400

[1,0,-4,8,0,-32,64,0,-256,512,0,-2048,4096,0,
 -16384,32768,0,-131072,262144,0,-1048576,2097152,
 0,-8388608,16777216,0,-67108864,134217728,0,
 -536870912,1073741824,0,-4294967296,8589934592,0,
 -34359738368,68719476736,0,-274877906944,
 549755813888,0]