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A337215 as a simple table

na(n)
15
28
39
410
513
616
717
818
920
1025
1126
1229
1332
1434
1536
1637
1740
1841
1945
2048
2149
2250

[5,8,9,10,13,16,17,18,20,25,26,29,32,34,36,37,40,
 41,45,48,49,50]