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A171524 as a simple table

na(n)
12
23
34
45
56
67
79
810
911
1012
1113
1214
1315
1416
1517
1619
1720
1821
1922
2023
2124
2225
2326
2427
2528
2629
2730
2831
2933
3034
3135
3236
3337
3438
3539
3640
3741
3842
3943
4044
4146
4247
4348
4449
4550
4651
4752
4853
4954
5055

[2,3,4,5,6,7,9,10,11,12,13,14,15,16,17,19,20,21,
 22,23,24,25,26,27,28,29,30,31,33,34,35,36,37,38,
 39,40,41,42,43,44,46,47,48,49,50,51,52,53,54,55]