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A253910 as a simple table

na(n)
121
234
356
478
5119
61310
71712
81914
92315
102916
113118
123720
134121
144322
154724
165325
175926
186127
196728
207130
217332
227933
238334
248935
259736
2610138
2710339
2810740
2910942
3011344
3112745
3213146
3313748
3413949
3514950
3615151
3715752
3816354
3916755
4017356
4117957
4218158
4319160
4419362
4519763
4619964
4721165
4822366
4922768
5022969

[21,34,56,78,119,1310,1712,1914,2315,2916,3118,
 3720,4121,4322,4724,5325,5926,6127,6728,7130,7332,
 7933,8334,8935,9736,10138,10339,10740,10942,11344,
 12745,13146,13748,13949,14950,15151,15752,16354,
 16755,17356,17957,18158,19160,19362,19763,19964,
 21165,22366,22768,22969]