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A281996 as a simple table

na(n)
29
3169
425
5121
69
71849
825
9169
1025
11529
129
132809
1449
15169
1625
1718769
189
1952441
2025
2149
22529
232209
249
25121
269
27169
2825
293481
309
312217121
3225
33529
349
35121
369
3722201
389
39169
4025
416889
429
4329929
44529
45169
469
4780089
489
491849
5025
51169
52169
5311449
549
55529
5625
57361
589

[9,169,25,121,9,1849,25,169,25,529,9,2809,49,169,
 25,18769,9,52441,25,49,529,2209,9,121,9,169,25,
 3481,9,2217121,25,529,9,121,9,22201,9,169,25,6889,
 9,29929,529,169,9,80089,9,1849,25,169,169,11449,9,
 529,25,361,9]