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A308875 as a simple table

na(n)
34
46
58
612
720
85
98
1016
1124
12120
13600
146
1510
1632
177
1812
1964
208
2114
22128
239
2416
25256
2610
2718
28512
2911
3020
311024
3212
3322
342048
3513
3624
374096
3814
3926
408192
4115
4228
4316384
4416
4530
4632768
4717
4832
4965536
5018
5134
52131072
5319
5436
55262144
5620
5738
58524288
5921
6040
611048576

[4,6,8,12,20,5,8,16,24,120,600,6,10,32,7,12,64,8,
 14,128,9,16,256,10,18,512,11,20,1024,12,22,2048,
 13,24,4096,14,26,8192,15,28,16384,16,30,32768,17,
 32,65536,18,34,131072,19,36,262144,20,38,524288,
 21,40,1048576]