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A337340 as a simple table

na(n)
10
21
34
416
59
649
725
8169
9144
10100
1136
12484
1364
1438
15289
161600
1781
181369
19121
20961
21729
22361
23196
244489
25576
26625
273844
28139
29225
302704
31324
3214641
331024
34784
351444
3612544
37400
381156
391764
408836
41441
426724
43529
443364
457569
461849
47676
4840804
493600
505329
512209
525776
53841
5434969
552025
564262
573249
58386
59900
6024649
611089

[0,1,4,16,9,49,25,169,144,100,36,484,64,38,289,
 1600,81,1369,121,961,729,361,196,4489,576,625,
 3844,139,225,2704,324,14641,1024,784,1444,12544,
 400,1156,1764,8836,441,6724,529,3364,7569,1849,
 676,40804,3600,5329,2209,5776,841,34969,2025,4262,
 3249,386,900,24649,1089]