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A249611 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1112
1213
1314
1415
1517
1618
1722
1823
1924
2027
2128
2229
2330
2434
2537
2638
2739
2840
2951
3055
3156
3259
3360
3465
3566
3670
3771
3872
3975
4078
4183
4284
4385
4486
4587
4689
4790
4894
4995
50107
51108
52109
53110
54111
55113
56114
57117
58118
59120
60123
61124
62131
63132

[2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,18,22,23,24,
 27,28,29,30,34,37,38,39,40,51,55,56,59,60,65,66,
 70,71,72,75,78,83,84,85,86,87,89,90,94,95,107,108,
 109,110,111,113,114,117,118,120,123,124,131,132]