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A257911 as a simple table

na(n)
12
21
34
45
53
67
712
86
913
108
1114
1210
1318
149
1519
1611
1720
1817
1928
2015
2127
2216
2329
2422
2536
2621
2737
2823
2938
3026
3143
3224
3342
3425
3544
3634
3754
3830
3951
4031
4153
4232
4355
4433
4557
4639
4764
4835
4961
5045
5172
5240
5368
5441
5570
5647
5777
5846
5978
6048
6179
62112
6349
6483
6550
6685
6759

[2,1,4,5,3,7,12,6,13,8,14,10,18,9,19,11,20,17,28,
 15,27,16,29,22,36,21,37,23,38,26,43,24,42,25,44,
 34,54,30,51,31,53,32,55,33,57,39,64,35,61,45,72,
 40,68,41,70,47,77,46,78,48,79,112,49,83,50,85,59]