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A214920 as a simple table

na(n)
21
31
42
51
63
73
86
95
108
117
129
139
1412
1511
1614
1713
1815
1915
2018
2117
2220
2319
2421
2521
2624
2723
2826
2925
3027
3127
3230
3329
3432
3531
3633
3733
3836
3935
4038
4137
4239
4339
4442
4541
4644
4743
4845
4945
5048
5147
5250
5349
5451
5551
5654
5753
5856
5955
6057
6157
6260
6359
6462
6561
6663
6763
6866
6965
7068
7167

[1,1,2,1,3,3,6,5,8,7,9,9,12,11,14,13,15,15,18,17,
 20,19,21,21,24,23,26,25,27,27,30,29,32,31,33,33,
 36,35,38,37,39,39,42,41,44,43,45,45,48,47,50,49,
 51,51,54,53,56,55,57,57,60,59,62,61,63,63,66,65,
 68,67]