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A071191 as a simple table

na(n)
12
23
34
45
56
67
79
89
910
1011
1113
1214
1314
1415
1517
1618
1719
1820
1921
2021
2122
2223
2325
2427
2526
2627
2728
2830
2931
3033
3133
3236
3334
3435
3537
3640
3738
3839
3941
4042
4143
4244
4346
4445
4546
4647
4749
4854
4950
5051
5152
5254
5355
5456
5557
5660
5758
5859
5961
6063
6162
6263
6365

[2,3,4,5,6,7,9,9,10,11,13,14,14,15,17,18,19,20,21,
 21,22,23,25,27,26,27,28,30,31,33,33,36,34,35,37,
 40,38,39,41,42,43,44,46,45,46,47,49,54,50,51,52,
 54,55,56,57,60,58,59,61,63,62,63,65]