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A291849 as a simple table

na(n)
18
2128
3648
42048
54913
65000
710368
819208
932768
1052488
1178608
1280000
13117128
14165888
15228488
16307328
17397953
18405000
19524288
20551368
21668168
22839808
23912673
241042568
251257728
261280000
271555848
281874048
292238728
302654208
313070625
323125000
333655808
344251528

[8,128,648,2048,4913,5000,10368,19208,32768,52488,
 78608,80000,117128,165888,228488,307328,397953,
 405000,524288,551368,668168,839808,912673,1042568,
 1257728,1280000,1555848,1874048,2238728,2654208,
 3070625,3125000,3655808,4251528]