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A016838 as a simple table

na(n)
09
149
2121
3225
4361
5529
6729
7961
81225
91521
101849
112209
122601
133025
143481
153969
164489
175041
185625
196241
206889
217569
228281
239025
249801
2510609
2611449
2712321
2813225
2914161
3015129
3116129
3217161
3318225

[9,49,121,225,361,529,729,961,1225,1521,1849,2209,
 2601,3025,3481,3969,4489,5041,5625,6241,6889,7569,
 8281,9025,9801,10609,11449,12321,13225,14161,
 15129,16129,17161,18225]