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A171178 as a simple table

na(n)
00
12
21
36
43
55
64
712
87
911
108
1110
129
1320
1413
1519
1614
1718
1815
1917
2016
2130
2221
2329
2422
2528
2623
2727
2824
2926
3025
3142
3231
3341
3432
3540
3633
3739
3834
3938
4035
4137
4236
4356
4443
4555
4644
4754
4845
4953
5046
5152
5247
5351
5448
5550
5649
5772
5857
5971
6058
6170
6259
6369
6460
6568

[0,2,1,6,3,5,4,12,7,11,8,10,9,20,13,19,14,18,15,
 17,16,30,21,29,22,28,23,27,24,26,25,42,31,41,32,
 40,33,39,34,38,35,37,36,56,43,55,44,54,45,53,46,
 52,47,51,48,50,49,72,57,71,58,70,59,69,60,68]