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A038520 as a simple table

na(n)
00
11
20
33
44
56
620
728
864
9136
10240
11528
121024
132016
144160
158128
1616384
1732896
1865280
19131328
20262144
21523776
221049600
232096128
244194304
258390656
2616773120
2733558528
2867108864
29134209536
30268451840
31536854528
321073741824

[0,1,0,3,4,6,20,28,64,136,240,528,1024,2016,4160,
 8128,16384,32896,65280,131328,262144,523776,
 1049600,2096128,4194304,8390656,16773120,33558528,
 67108864,134209536,268451840,536854528,1073741824]