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A247815 as a simple table

na(n)
10
21
31
43
52
65
73
85
95
107
114
129
135
149
157
1610
176
1814
197
2013
2110
2213
238
2418
2510
2614
2711
2816
299
3026
3110
3217
3314
3418
3513
3626
3711
3820
3916
4023
4112
4231
4313
4422
4521
4622
4714
4832
4915
5028
5120
5227
5315
5435
5519
5629
5722
5828
5916
6045
6117
6229
6327
6430
6521
6644
6718
6832
6926

[0,1,1,3,2,5,3,5,5,7,4,9,5,9,7,10,6,14,7,13,10,13,
 8,18,10,14,11,16,9,26,10,17,14,18,13,26,11,20,16,
 23,12,31,13,22,21,22,14,32,15,28,20,27,15,35,19,
 29,22,28,16,45,17,29,27,30,21,44,18,32,26]