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A006593 as a simple table

na(n)
13
25
316
412
515
6125
724
840
975
1048
1180
1272
1384
1460
1565536
16192
17144
18524288
19384
20640
219375
22168
23120
24300
251536
26520
27576
283072
29975
302147483648
31336
32240
331171875
341500
351040
36137438953472
37504
38360
39600
40672
41420
424608
4350000
44780
453456
46196608
479216

[3,5,16,12,15,125,24,40,75,48,80,72,84,60,65536,
 192,144,524288,384,640,9375,168,120,300,1536,520,
 576,3072,975,2147483648,336,240,1171875,1500,1040,
 137438953472,504,360,600,672,420,4608,50000,780,
 3456,196608,9216]