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A273374 as a simple table

na(n)
19
249
3169
4289
5529
6729
71089
81369
91849
102209
112809
123249
133969
144489
155329
165929
176889
187569
198649
209409
2110609
2211449
2312769
2413689
2515129
2616129
2717689
2818769
2920449
3021609
3123409
3224649
3326569
3427889
3529929
3631329
3733489
3834969
3937249
4038809

[9,49,169,289,529,729,1089,1369,1849,2209,2809,
 3249,3969,4489,5329,5929,6889,7569,8649,9409,
 10609,11449,12769,13689,15129,16129,17689,18769,
 20449,21609,23409,24649,26569,27889,29929,31329,
 33489,34969,37249,38809]