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A253792 as a simple table

na(n)
00
11
22
34
43
57
632
717
85
916
1013
11256
1212
13257
1438
154096
168
1764
1835
1931
2066
2132768
22135
23259
24131072
254097
268194
27536870912
2832771
2965539
3018446744073709551616
31262145
326
3319
3434
3525
36513
374194304
381029
39260
4055
412051
428796093022208
434194305
4493
4536028797018963968
464194309
471032
48132
49145
5067108866
51160
52262151
534111

[0,1,2,4,3,7,32,17,5,16,13,256,12,257,38,4096,8,
 64,35,31,66,32768,135,259,131072,4097,8194,
 536870912,32771,65539,18446744073709551616,262145,
 6,19,34,25,513,4194304,1029,260,55,2051,
 8796093022208,4194305,93,36028797018963968,
 4194309,1032,132,145,67108866,160,262151,4111]