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A038521 as a simple table

na(n)
00
10
22
31
44
510
612
736
864
9120
10272
11496
121024
132080
144032
158256
1616384
1732640
1865792
19130816
20262144
21524800
221047552
232098176
244194304
258386560
2616781312
2733550336
2867108864
29134225920
30268419072
31536887296
321073741824
332147450880
344295032832
358589869056

[0,0,2,1,4,10,12,36,64,120,272,496,1024,2080,4032,
 8256,16384,32640,65792,130816,262144,524800,
 1047552,2098176,4194304,8386560,16781312,33550336,
 67108864,134225920,268419072,536887296,1073741824,
 2147450880,4295032832,8589869056]