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A131565 as a simple table

na(n)
12
23
34
45
56
67
78
810
911
1013
1114
1215
1316
1417
1518
1619
1720
1821
1922
2028
2130
2231
2333
2434
2535
2637
2738
2839
2940
3042
3144
3245
3347
3451
3552
3653
3755
3856
3958
4059
4161
4264
4365
4466
4569
4672
4776
4879
4981
5082
5184
5286
5387
5491
5595
5698
57100
58102
59103
60104
61105
62107
63108
64109
65113
66115
67116
68118

[2,3,4,5,6,7,8,10,11,13,14,15,16,17,18,19,20,21,
 22,28,30,31,33,34,35,37,38,39,40,42,44,45,47,51,
 52,53,55,56,58,59,61,64,65,66,69,72,76,79,81,82,
 84,86,87,91,95,98,100,102,103,104,105,107,108,109,
 113,115,116,118]