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A337742 as a simple table

na(n)
13
26
315
412
5255
630
763
824
9315
10510
1133825
1260
13159783
14126
15255
1648
1765535
18630
1914942265
201020
214095
2267650
234194303
24120
2517825775
26319566
271310715
28252
2923353884759
30510
311023
3296
331048575
34131070
3516777215
361260
377627861917807
3829884530
395592405

[3,6,15,12,255,30,63,24,315,510,33825,60,159783,
 126,255,48,65535,630,14942265,1020,4095,67650,
 4194303,120,17825775,319566,1310715,252,
 23353884759,510,1023,96,1048575,131070,16777215,
 1260,7627861917807,29884530,5592405]