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A199424 as a simple table

na(n)
12
23
34
44
56
65
78
89
96
106
1112
127
1314
1415
1516
167
1718
1819
1920
209
2122
2223
2324
2425
258
2627
2728
288
2930
3031
3111
3233
3334
3435
3536
369
3712
3839
3940
4041
4142
4243
4313
4445
4546
4647
479
4810
4950
5014
5152
5253
5354
5455
5556
5657
5758
5815
5960
6061
6162
6263
6364
6465
6566
6616
6711
6869
6970

[2,3,4,4,6,5,8,9,6,6,12,7,14,15,16,7,18,19,20,9,
 22,23,24,25,8,27,28,8,30,31,11,33,34,35,36,9,12,
 39,40,41,42,43,13,45,46,47,9,10,50,14,52,53,54,55,
 56,57,58,15,60,61,62,63,64,65,66,16,11,69,70]