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A273301 as a simple table

na(n)
01
15
226
355
4127
5215
6371
7531
8800
91069
101465
111885
122465
133037
143821
154557
165565
176533
187849
199197
2010769
2112301
2214197
2315993
2418206
2520363
2622984
2725509
2828526
2931343
3034756
3137929
3241810
3345435
3449980
3554253
3659286
3764071
3869608
3974817
4080906
4186739

[1,5,26,55,127,215,371,531,800,1069,1465,1885,
 2465,3037,3821,4557,5565,6533,7849,9197,10769,
 12301,14197,15993,18206,20363,22984,25509,28526,
 31343,34756,37929,41810,45435,49980,54253,59286,
 64071,69608,74817,80906,86739]