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A163501 as a simple table

na(n)
12
21
34
43
56
65
78
87
910
109
1112
1230
1314
1420
1516
1622
1718
1823
1921
2031
2133
2234
2340
2425
2536
2627
2735
2829
2937
3041
3142
3238
3344
3450
3546
3645
3748
3847
3943
4051
4152
4253
4355
4456
4560
4657
4758
4859
4954
5061
5162
5263
5364
5466
5567
5670
5768
5869
5971
6072
6173
6274
6375
6477
6576
6678
6780
6879
6981
7082
7183
7284

[2,1,4,3,6,5,8,7,10,9,12,30,14,20,16,22,18,23,21,
 31,33,34,40,25,36,27,35,29,37,41,42,38,44,50,46,
 45,48,47,43,51,52,53,55,56,60,57,58,59,54,61,62,
 63,64,66,67,70,68,69,71,72,73,74,75,77,76,78,80,
 79,81,82,83,84]