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A071660 as a simple table

na(n)
00
11
23
32
46
58
67
74
85
915
1014
1119
1220
1322
1416
1521
1617
179
1810
1918
2011
2112
2213
2339
2441
2540
2637
2738
2852
2951
3053
3155
3254
3360
3461
3562
3664
3743
3842
3956
4057
4163
4244
4358
4445
4523
4624
4746
4825
4926
5027
5147
5259
5348
5428
5529
5649
5730
5831
5932
6050
6133
6234
6335
6436
65113
66112
67117
68118
69120

[0,1,3,2,6,8,7,4,5,15,14,19,20,22,16,21,17,9,10,
 18,11,12,13,39,41,40,37,38,52,51,53,55,54,60,61,
 62,64,43,42,56,57,63,44,58,45,23,24,46,25,26,27,
 47,59,48,28,29,49,30,31,32,50,33,34,35,36,113,112,
 117,118,120]