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A299505 as a simple table

na(n)
15
231
380
4121
5211
6341
7405
8496
9781
101031
111280
121441
131555
141936
152101
162511
172801
183125
193355
203376
214141
224651
234681
245261
255456
266480
276505
286841
297381
307936
318431
329031
339801
349881
3511111
3611605
3712005
3812496
3913981
4014251
4115961
4216105
4316496
4417091
4517891

[5,31,80,121,211,341,405,496,781,1031,1280,1441,
 1555,1936,2101,2511,2801,3125,3355,3376,4141,4651,
 4681,5261,5456,6480,6505,6841,7381,7936,8431,9031,
 9801,9881,11111,11605,12005,12496,13981,14251,
 15961,16105,16496,17091,17891]