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A121701 as a simple table

na(n)
11
21
32
43
54
62
75
83
96
104
117
128
139
145
1510
1611
1712
186
1913
2014
2115
227
2316
248
2517
269
2718
2819
2920
3010
3121
3211
3322
3412
3523
3624
3725
3813
3926
4014
4127
4215
4328
4429
4530
4616
4731
4832
4933
5017
5134
5235
5336
5418
5537
5619
5738
5820
5939
6040
6141
6221
6342
6443
6544
6622
6745
6846
6947
7023
7148
7224
7349
7425
7550

[1,1,2,3,4,2,5,3,6,4,7,8,9,5,10,11,12,6,13,14,15,
 7,16,8,17,9,18,19,20,10,21,11,22,12,23,24,25,13,
 26,14,27,15,28,29,30,16,31,32,33,17,34,35,36,18,
 37,19,38,20,39,40,41,21,42,43,44,22,45,46,47,23,
 48,24,49,25,50]