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A257881 as a simple table

na(n)
12
21
33
46
54
68
75
810
916
1012
117
1214
1322
1415
159
1618
1728
1820
1911
2023
2113
2224
2337
2426
2540
2627
2742
2830
2946
3032
3117
3234
3352
3436
3519
3638
3758
3839
3921
4043
4164
4244
4367
4445
4569
4648
4725
4850
4976
5051
5178
5254
5382
5456
5529
5659
5731
5860
5991
6062
6194
6263
6333
6466
65100
6668
6735

[2,1,3,6,4,8,5,10,16,12,7,14,22,15,9,18,28,20,11,
 23,13,24,37,26,40,27,42,30,46,32,17,34,52,36,19,
 38,58,39,21,43,64,44,67,45,69,48,25,50,76,51,78,
 54,82,56,29,59,31,60,91,62,94,63,33,66,100,68,35]