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A074681 as a simple table

na(n)
00
11
23
32
46
58
67
75
84
915
1014
1119
1220
1322
1416
1521
1618
1711
1813
1917
2012
2110
229
2339
2441
2540
2638
2737
2852
2951
3053
3155
3254
3360
3461
3562
3664
3743
3842
3956
4057
4163
4247
4359
4448
4529
4628
4750
4833
4934
5036
5144
5258
5349
5430
5535
5646
5732
5825
5927
6045
6131
6226
6324
6423
65113
66112
67117
68118
69120

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