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A131171 as a simple table

na(n)
00
11
23
32
47
56
68
75
84
917
1016
1118
1214
1315
1420
1519
1621
1711
1812
1922
2013
2110
229
2345
2444
2546
2643
2742
2848
2947
3049
3141
3238
3350
3437
3540
3639
3754
3853
3955
4051
4152
4257
4356
4458
4529
4628
4759
4830
4931
5032
5161
5260
5362
5433
5534
5663
5735
5825
5926
6064
6136
6227
6324
6423
65129
66128
67130
68126
69127

[0,1,3,2,7,6,8,5,4,17,16,18,14,15,20,19,21,11,12,
 22,13,10,9,45,44,46,43,42,48,47,49,41,38,50,37,40,
 39,54,53,55,51,52,57,56,58,29,28,59,30,31,32,61,
 60,62,33,34,63,35,25,26,64,36,27,24,23,129,128,
 130,126,127]