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A071218 as a simple table

na(n)
12
23
34
45
56
67
78
810
913
1014
1115
1216
1317
1418
1520
1621
1722
1825
1926
2027
2128
2230
2333
2434
2535
2636
2737
2838
2939
3040
3141
3242
3343
3444
3545
3646
3747
3848
3949
4050
4152
4253
4355
4456
4557
4659
4760
4861
4962
5064
5165
5266
5368
5469
5570
5672
5773
5874
5978
6079
6180
6281
6382
6483
6585
6688
6789
6890
6991
7092
7194

[2,3,4,5,6,7,8,10,13,14,15,16,17,18,20,21,22,25,
 26,27,28,30,33,34,35,36,37,38,39,40,41,42,43,44,
 45,46,47,48,49,50,52,53,55,56,57,59,60,61,62,64,
 65,66,68,69,70,72,73,74,78,79,80,81,82,83,85,88,
 89,90,91,92,94]