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A298472 as a simple table

na(n)
121
236
356
4253
5496
6561
71771
82926
93655
105985
1126335
122895621
132919736
146471003
1521474181
1648792381
17346700278
18402073903
191260501229261
2012864662659597529

[21,36,56,253,496,561,1771,2926,3655,5985,26335,
 2895621,2919736,6471003,21474181,48792381,
 346700278,402073903,1260501229261,
 12864662659597529]