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A273359 as a simple table

na(n)
19
241
384
4225
5356
6489
7624
8761
9900
101209
111616
122025
132436
142849
153264
163681
174100
184521
194944
205369
215796
226225
236656
247089
257524
267961
278400
288841
299284
309729
3110881
3212164
3313449
3414736
3516025
3617316
3718609
3819904
3921201
4022500

[9,41,84,225,356,489,624,761,900,1209,1616,2025,
 2436,2849,3264,3681,4100,4521,4944,5369,5796,6225,
 6656,7089,7524,7961,8400,8841,9284,9729,10881,
 12164,13449,14736,16025,17316,18609,19904,21201,
 22500]