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A253791 as a simple table

na(n)
00
11
22
34
43
58
632
75
816
964
10256
11128
1212
1310
1416384
15512
169
177
182048
1933
20257
2132768
224194304
238192
248388608
2535
268589934592
27262144
284194305
2967108864
30260
3119
326
334096
3434
3518
36134217728
372097152
3814
391048576
40131
414294967296
42136
4368
44295147905179352825856
45549755813888
4636028797018963968
47130
482251799813685248
4969

[0,1,2,4,3,8,32,5,16,64,256,128,12,10,16384,512,9,
 7,2048,33,257,32768,4194304,8192,8388608,35,
 8589934592,262144,4194305,67108864,260,19,6,4096,
 34,18,134217728,2097152,14,1048576,131,4294967296,
 136,68,295147905179352825856,549755813888,
 36028797018963968,130,2251799813685248,69]