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A215892 as a simple table

na(n)
20
35
40
57
628
779
8192
9431
1024
11717
122368
135995
1413640
1529393
160
1747551
18157168
19393967
20888576
211902671
223960048
231952265
248814592
2523788807
2655227488
27119868821
28251225088
29516359763
30344741824
311259979967
323221225472
337298466623
3415635064768

[0,5,0,7,28,79,192,431,24,717,2368,5995,13640,
 29393,0,47551,157168,393967,888576,1902671,
 3960048,1952265,8814592,23788807,55227488,
 119868821,251225088,516359763,344741824,
 1259979967,3221225472,7298466623,15635064768]