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A166444 as a simple table

na(n)
00
11
21
32
44
58
616
732
864
9128
10256
11512
121024
132048
144096
158192
1616384
1732768
1865536
19131072
20262144
21524288
221048576
232097152
244194304
258388608
2616777216
2733554432
2867108864
29134217728
30268435456
31536870912
321073741824
332147483648
344294967296
358589934592

[0,1,1,2,4,8,16,32,64,128,256,512,1024,2048,4096,
 8192,16384,32768,65536,131072,262144,524288,
 1048576,2097152,4194304,8388608,16777216,33554432,
 67108864,134217728,268435456,536870912,1073741824,
 2147483648,4294967296,8589934592]