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A038505 as a simple table

na(n)
00
10
21
33
46
510
616
728
856
9120
10256
11528
121056
132080
144096
158128
1616256
1732640
1865536
19131328
20262656
21524800
221048576
232096128
244192256
258386560
2616777216
2733558528
2867117056
29134225920
30268435456
31536854528
321073709056

[0,0,1,3,6,10,16,28,56,120,256,528,1056,2080,4096,
 8128,16256,32640,65536,131328,262656,524800,
 1048576,2096128,4192256,8386560,16777216,33558528,
 67117056,134225920,268435456,536854528,1073709056]