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A226224 as a simple table

na(n)
21
325
49
564
6100
7144
849
964
1081
11225
12121
13441
14169
15441
16441
17256
18289
19324
20361
211296
221296
23484
24529
251089
26625
27676
28729
292401
30841
312601
32961
331024
343025
351156
362500
374096
381369
391444
404356
413136
421681
434900
441849
455929
463025
472116
482209
496561
502401

[1,25,9,64,100,144,49,64,81,225,121,441,169,441,
 441,256,289,324,361,1296,1296,484,529,1089,625,
 676,729,2401,841,2601,961,1024,3025,1156,2500,
 4096,1369,1444,4356,3136,1681,4900,1849,5929,3025,
 2116,2209,6561,2401]