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A038503 as a simple table

na(n)
01
11
21
31
42
56
616
736
872
9136
10256
11496
12992
132016
144096
158256
1616512
1732896
1865536
19130816
20261632
21523776
221048576
232098176
244196352
258390656
2616777216
2733550336
2867100672
29134209536
30268435456
31536887296
321073774592
332147516416
344294967296
358589869056
3617179738112

[1,1,1,1,2,6,16,36,72,136,256,496,992,2016,4096,
 8256,16512,32896,65536,130816,261632,523776,
 1048576,2098176,4196352,8390656,16777216,33550336,
 67100672,134209536,268435456,536887296,1073774592,
 2147516416,4294967296,8589869056,17179738112]