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A262221 as a simple table

na(n)
01
126
276
3151
4251
5376
6526
7701
8901
91126
101376
111651
121951
132276
142626
153001
163401
173826
184276
194751
205251
215776
226326
236901
247501
258126
268776
279451
2810151
2910876
3011626
3112401
3213201
3314026
3414876
3515751
3616651
3717576
3818526
3919501
4020501
4121526
4222576
4323651

[1,26,76,151,251,376,526,701,901,1126,1376,1651,
 1951,2276,2626,3001,3401,3826,4276,4751,5251,5776,
 6326,6901,7501,8126,8776,9451,10151,10876,11626,
 12401,13201,14026,14876,15751,16651,17576,18526,
 19501,20501,21526,22576,23651]