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A038518 as a simple table

na(n)
00
11
21
31
46
56
616
736
856
9136
10256
11496
121056
132016
144096
158256
1616256
1732896
1865536
19130816
20262656
21523776
221048576
232098176
244192256
258390656
2616777216
2733550336
2867117056
29134209536
30268435456
31536887296
321073709056
332147516416

[0,1,1,1,6,6,16,36,56,136,256,496,1056,2016,4096,
 8256,16256,32896,65536,130816,262656,523776,
 1048576,2098176,4192256,8390656,16777216,33550336,
 67117056,134209536,268435456,536887296,1073709056,
 2147516416]