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A307745 as a simple table

na(n)
11521
21600
32401
42744
56084
617689
761009
8244036
9294849
101179396
111483524
122653641
132725801
142989441
154717584
165239521
177371225
189591409
1910614564
2011957764
2114447601
2217397241
2318870336
2420277009
2520958084
2623882769
2726904969
2829484900
2938365636
3038825361

[1521,1600,2401,2744,6084,17689,61009,244036,
 294849,1179396,1483524,2653641,2725801,2989441,
 4717584,5239521,7371225,9591409,10614564,11957764,
 14447601,17397241,18870336,20277009,20958084,
 23882769,26904969,29484900,38365636,38825361]