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A281900 as a simple table

na(n)
21
33
46
57
615
716
834
9240
10241
11317
12502
13503
14504
15505
161077
171178
181179
191806
204866
214901
224902
234946
244947
258195
268196
278197
288198
298199
308200
318201
328202
338203
348204
3545393
3645485
3745486
3896358
3996359
4096360
4196361
4296362
4396363
4496364
4596365
4696366

[1,3,6,7,15,16,34,240,241,317,502,503,504,505,
 1077,1178,1179,1806,4866,4901,4902,4946,4947,8195,
 8196,8197,8198,8199,8200,8201,8202,8203,8204,
 45393,45485,45486,96358,96359,96360,96361,96362,
 96363,96364,96365,96366]