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A249990 as a simple table

na(n)
12
21
36
43
54
612
75
88
97
1016
119
1210
1313
1414
1522
1615
1718
1811
1924
2017
2132
2225
2326
2419
2520
2623
2730
2848
2931
3038
3121
3228
3327
3434
3533
3652
3735
3842
3929
4036
4139
4240
4349
4450
4558
4651
4754
4841
4944
5037
5160
5243
5366
5453
5584
5667
5768
5861
5962
6045
6146
6255
6356
6459
6576
6694
6777
6890

[2,1,6,3,4,12,5,8,7,16,9,10,13,14,22,15,18,11,24,
 17,32,25,26,19,20,23,30,48,31,38,21,28,27,34,33,
 52,35,42,29,36,39,40,49,50,58,51,54,41,44,37,60,
 43,66,53,84,67,68,61,62,45,46,55,56,59,76,94,77,
 90]