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A248539 as a simple table

na(n)
12
215
352
4113
5246
6427
7704
81113
91654
102279
113072
124045
135210
146555
158116
169953
1712054
1814383
1916976
2019929
2123194
2226735
2330636
2434993
2539686
2644751
2750212
2856201
2962646
3069451
3176712
3284609
3393010
34101879
35111252
36121321
37131942
38143103
39154840

[2,15,52,113,246,427,704,1113,1654,2279,3072,4045,
 5210,6555,8116,9953,12054,14383,16976,19929,23194,
 26735,30636,34993,39686,44751,50212,56201,62646,
 69451,76712,84609,93010,101879,111252,121321,
 131942,143103,154840]