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A246982 as a simple table

na(n)
21
31
43
52
64
76
82
94
108
1110
123
136
149
1513
1615
173
187
199
2015
2119
2221
234
248
2512
2616
2722
2826
2928
304
319
3214
3316
3424
3530
3634
3736
385
3910
4016
4120
4225
4333
4439
4543
4645
475
4811
4917
5023
5125
5235
5343
5449
5553
5655
576
5812
5918
6026
6130
6236
6346
6454
6560
6664
6766
686
6913
7020

[1,1,3,2,4,6,2,4,8,10,3,6,9,13,15,3,7,9,15,19,21,
 4,8,12,16,22,26,28,4,9,14,16,24,30,34,36,5,10,16,
 20,25,33,39,43,45,5,11,17,23,25,35,43,49,53,55,6,
 12,18,26,30,36,46,54,60,64,66,6,13,20]