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A306441 as a simple table

na(n)
12
23
34
46
59
67
78
812
910
1011
1113
1214
1317
1415
1516
1624
1718
1819
1920
2022
2137
2223
2325
2428
2526
2627
2729
2830
2933
3031
3132
3248
3334
3435
3536
3638
3741
3839
3940
4044
4142
4243
4345
4446
4553
4647
4749
4856
4950
5051
5152
5254
5369
5455
5557
5660
5758
5859
5961
6062
6165
6263
6364
6496
6566
6667
6768

[2,3,4,6,9,7,8,12,10,11,13,14,17,15,16,24,18,19,
 20,22,37,23,25,28,26,27,29,30,33,31,32,48,34,35,
 36,38,41,39,40,44,42,43,45,46,53,47,49,56,50,51,
 52,54,69,55,57,60,58,59,61,62,65,63,64,96,66,67,
 68]