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A046268 as a simple table

na(n)
00
12
20
30
40
53
60
72
85
95
102
112
12409
1319
14163
157
166553
17131
182621
195
20857
21971
22419
2383
241677721
255443
2671
271342177
2843
29709
30107
3183
324294967
3389
34171798691
353597383
366871947673
373743895347
38779069
3954975581
40511627
4199023
424398046511
4379609
4418604441
45883

[0,2,0,0,0,3,0,2,5,5,2,2,409,19,163,7,6553,131,
 2621,5,857,971,419,83,1677721,5443,71,1342177,43,
 709,107,83,4294967,89,171798691,3597383,
 6871947673,3743895347,779069,54975581,511627,
 99023,4398046511,79609,18604441,883]