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A038470 as a simple table

na(n)
15
217
320
465
568
680
7257
8260
9272
10320
111025
121028
131040
141088
151280
164097
174100
184112
194160
204352
215120
2216385
2316388
2416400
2516448
2616640
2717408
2820480
2965537
3065540
3165552
3265600
3365792
3466560
3569632
3681920
37262145
38262148
39262160
40262208
41262400
42263168

[5,17,20,65,68,80,257,260,272,320,1025,1028,1040,
 1088,1280,4097,4100,4112,4160,4352,5120,16385,
 16388,16400,16448,16640,17408,20480,65537,65540,
 65552,65600,65792,66560,69632,81920,262145,262148,
 262160,262208,262400,263168]