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A001751 as a simple table

na(n)
12
23
34
45
56
67
710
811
913
1014
1117
1219
1322
1423
1526
1629
1731
1834
1937
2038
2141
2243
2346
2447
2553
2658
2759
2861
2962
3067
3171
3273
3374
3479
3582
3683
3786
3889
3994
4097
41101
42103
43106
44107
45109
46113
47118
48122
49127
50131
51134
52137
53139
54142
55146
56149
57151
58157
59158
60163
61166

[2,3,4,5,6,7,10,11,13,14,17,19,22,23,26,29,31,34,
 37,38,41,43,46,47,53,58,59,61,62,67,71,73,74,79,
 82,83,86,89,94,97,101,103,106,107,109,113,118,122,
 127,131,134,137,139,142,146,149,151,157,158,163,
 166]