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A244364 as a simple table

na(n)
13
24
32
433
517
6319
7639
81279
92559
105119
1110239
1220479
1340959
1481919
15163839
16327679
17655359
181310719
192621439
205242879
2110485759
2220971519
2341943039
2483886079
25167772159
26335544319
27671088639

[3,4,2,33,17,319,639,1279,2559,5119,10239,20479,
 40959,81919,163839,327679,655359,1310719,2621439,
 5242879,10485759,20971519,41943039,83886079,
 167772159,335544319,671088639]