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A273767 as a simple table

na(n)
01
14
248
3225
4961
53969
616129
765025
8261121
91046529
104190209
1116769025
1267092481
13268402689
141073676289
154294836225

[1,4,48,225,961,3969,16129,65025,261121,1046529,
 4190209,16769025,67092481,268402689,1073676289,
 4294836225]