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A257333 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1112
1213
1314
1415
1516
1617
1718
1819
1920
2021
2122
2223
2324
2425
2526
2627
2728
2829
2930
3031
3132
3235
3334
3433
3538
3637
3736
3841
3939
4043
4140
4247
4344
4445
4546
4649
4750
4853
4955
5042
5159
5251
5352
5457
5556
5661
5748
5865
5954
6067
6158
6263
6362
6471
6560
6673
6764

[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
 21,22,23,24,25,26,27,28,29,30,31,32,35,34,33,38,
 37,36,41,39,43,40,47,44,45,46,49,50,53,55,42,59,
 51,52,57,56,61,48,65,54,67,58,63,62,71,60,73,64]