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A247021 as a simple table

na(n)
11
215
321
445
555
6171
7741
81225
91275
101711
112145
122211
132415
142775
155151
1611175
1715225
1821115
1922155
2025425
2144551
2245451
2372771
2477421
25112575
26121771
27124251
28125751
29151525
30211575
31221445
32222111
33224115
34227475
35254541
36255255
37417241
38451725
39551775
40577275

[1,15,21,45,55,171,741,1225,1275,1711,2145,2211,
 2415,2775,5151,11175,15225,21115,22155,25425,
 44551,45451,72771,77421,112575,121771,124251,
 125751,151525,211575,221445,222111,224115,227475,
 254541,255255,417241,451725,551775,577275]