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A281364 as a simple table

na(n)
121
222
355
4129
5511
6770
71070
81071
91074
101434
111708
121914
132721
142926
153080
164195
174464
184814
194879
205236
215907
226086
236114
247228
257831
268029
278289
289086
2910149
3010547
3111145
3212305
3312621
3413348
3514993
3615012
3716212
3817670
3919513
4020020
4120083

[21,22,55,129,511,770,1070,1071,1074,1434,1708,
 1914,2721,2926,3080,4195,4464,4814,4879,5236,5907,
 6086,6114,7228,7831,8029,8289,9086,10149,10547,
 11145,12305,12621,13348,14993,15012,16212,17670,
 19513,20020,20083]