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A115075 as a simple table

na(n)
11
24
39
420
525
636
749
880
999
10100
11121
12180
13169
14196
15225
16352
17289
18396
19361
20500
21441
22484
23529
24720
25725
26676
27891
28980
29841
30900
31961
321408
331089
341156
351225
361980
371369
381444
391521
402000
411681
421764
431849
442420
452475
462116
472209
483168
492695
502900

[1,4,9,20,25,36,49,80,99,100,121,180,169,196,225,
 352,289,396,361,500,441,484,529,720,725,676,891,
 980,841,900,961,1408,1089,1156,1225,1980,1369,
 1444,1521,2000,1681,1764,1849,2420,2475,2116,2209,
 3168,2695,2900]