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A066113 as a simple table

na(n)
20
31
42
53
65
75
86
98
107
117
1211
139
149
1511
1612
1710
1813
1910
2014
2114
2213
2313
2419
2515
2615
2718
2820
2915
3021
3120
3222
3320
3418
3521
3627
3719
3821
3921
4027
4121
4227
4322
4426
4529
4624
4724
4832
4927
5031
5127
5231
5327
5433
5530
5635
5734
5830
5930
6041
6131
6233
6340
6440
6541
6640
6734
6839
6936
7040

[0,1,2,3,5,5,6,8,7,7,11,9,9,11,12,10,13,10,14,14,
 13,13,19,15,15,18,20,15,21,20,22,20,18,21,27,19,
 21,21,27,21,27,22,26,29,24,24,32,27,31,27,31,27,
 33,30,35,34,30,30,41,31,33,40,40,41,40,34,39,36,
 40]