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A253564 as a simple table

na(n)
10
21
33
42
57
65
715
84
96
1011
1131
129
1363
1423
1513
168
17127
1810
19255
2019
2127
2247
23511
2417
2514
2695
2712
2839
291023
3021
312047
3216
3355
34191
3529
3618
374095
38383
39111
4035
418191
4243
4316383
4479
4525
46767
4732767
4833
4930
5022
51223
52159
5365535
5420
5559
5671
57447

[0,1,3,2,7,5,15,4,6,11,31,9,63,23,13,8,127,10,255,
 19,27,47,511,17,14,95,12,39,1023,21,2047,16,55,
 191,29,18,4095,383,111,35,8191,43,16383,79,25,767,
 32767,33,30,22,223,159,65535,20,59,71,447]