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A215591 as a simple table

na(n)
10
21
32
43
50
64
71
85
92
106
113
120
137
144
151
168
175
182
199
206
213
220
2310
247
254
261
2711
288
295
302
3112
329
336
343
3513
360
3710
387
394
4014
411
4211
438
445
4515
462
4712
489
496
5016
513
5213
530
5410
557
5617
574
5814
591
6011
618
6218
635
6415
652
6612
679
6819
696
7016
713
7213

[0,1,2,3,0,4,1,5,2,6,3,0,7,4,1,8,5,2,9,6,3,0,10,7,
 4,1,11,8,5,2,12,9,6,3,13,0,10,7,4,14,1,11,8,5,15,
 2,12,9,6,16,3,13,0,10,7,17,4,14,1,11,8,18,5,15,2,
 12,9,19,6,16,3,13]