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A228540 as a simple table

na(n)
01
13
21
315
45
53
69
7255
885
951
10153
1115
12165
13195
14105
1565535
1621845
1713107
1839321
193855
2042405
2150115
2226985
23255
2443605
2552275
2626265
2761455
2823205
2915555
3038505
314294967295
321431655765
33858993459
342576980377
35252645135
362779096485
373284386755

[1,3,1,15,5,3,9,255,85,51,153,15,165,195,105,
 65535,21845,13107,39321,3855,42405,50115,26985,
 255,43605,52275,26265,61455,23205,15555,38505,
 4294967295,1431655765,858993459,2576980377,
 252645135,2779096485,3284386755]