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A142721 as a simple table

na(n)
00
12
21
35
42
56
63
711
84
912
105
1113
126
1314
147
1523
168
1724
189
1925
2010
2126
2211
2327
2412
2528
2613
2729
2814
2930
3015
3147
3216
3348
3417
3549
3618
3750
3819
3951
4020
4152
4221
4353
4422
4554
4623
4755
4824
4956
5025
5157
5226
5358
5427
5559
5628
5760
5829
5961
6030
6162
6231
6395
6432
6596
6633
6797
6834
6998
7035
7199
7236
73100

[0,2,1,5,2,6,3,11,4,12,5,13,6,14,7,23,8,24,9,25,
 10,26,11,27,12,28,13,29,14,30,15,47,16,48,17,49,
 18,50,19,51,20,52,21,53,22,54,23,55,24,56,25,57,
 26,58,27,59,28,60,29,61,30,62,31,95,32,96,33,97,
 34,98,35,99,36,100]