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A123688 as a simple table

na(n)
11
23
36
45
58
67
77
811
98
109
119
1212
137
1411
1512
1611
1716
188
1913
2012
2113
2216
238
247
258
268
2712
286
298
3014
3113
325
3316
3413
3511
3619
3716
388
3920
4019
4115
4211
4312
4413
457
469
478
489
4914
506
5112
5211
5313
5420
5518
5613
579
5812
5914
6013
6114
6211
6313
6414
6513
6613
6716
6813
6910
7010
7117
7220
7310
7413
7510
7620
7711
7819
7917

[1,3,6,5,8,7,7,11,8,9,9,12,7,11,12,11,16,8,13,12,
 13,16,8,7,8,8,12,6,8,14,13,5,16,13,11,19,16,8,20,
 19,15,11,12,13,7,9,8,9,14,6,12,11,13,20,18,13,9,
 12,14,13,14,11,13,14,13,13,16,13,10,10,17,20,10,
 13,10,20,11,19,17]