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A113820 as a simple table

na(n)
12
21
34
48
512
616
73
89
910
1011
1118
1224
1326
1432
1534
1617
1725
1833
1940
2041
2148
2256
2364
2472
2580
2688
2796
28104
295
306
317
3219
3320
3421
3522
3623
3736
3838
3950
4052
4154
4266
4368
4470
4582
4637
4749
4853
4965
5069
5181
5284
5385
5497
55100
56112
57116
58128
59132
60144
61148
62160
63164
64176
65180
66192
6735
6851

[2,1,4,8,12,16,3,9,10,11,18,24,26,32,34,17,25,33,
 40,41,48,56,64,72,80,88,96,104,5,6,7,19,20,21,22,
 23,36,38,50,52,54,66,68,70,82,37,49,53,65,69,81,
 84,85,97,100,112,116,128,132,144,148,160,164,176,
 180,192,35,51]