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A066311 as a simple table

na(n)
12
23
34
45
56
67
78
89
911
1012
1113
1215
1316
1417
1518
1619
1723
1824
1925
2027
2129
2230
2331
2432
2535
2636
2737
2841
2943
3045
3147
3248
3349
3453
3554
3659
3760
3861
3964
4067
4171
4272
4373
4475
4577
4679
4781
4883
4989
5090
5196
5297
53101
54103
55105
56107
57108
58109
59113
60120
61121
62125
63127
64128
65131
66135
67137

[2,3,4,5,6,7,8,9,11,12,13,15,16,17,18,19,23,24,25,
 27,29,30,31,32,35,36,37,41,43,45,47,48,49,53,54,
 59,60,61,64,67,71,72,73,75,77,79,81,83,89,90,96,
 97,101,103,105,107,108,109,113,120,121,125,127,
 128,131,135,137]