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A020915 as a simple table

na(n)
01
11
22
32
43
54
64
75
86
96
107
117
128
139
149
1510
1611
1711
1812
1912
2013
2114
2214
2315
2416
2516
2617
2718
2818
2919
3019
3120
3221
3321
3422
3523
3623
3724
3824
3925
4026
4126
4227
4328
4428
4529
4630
4730
4831
4931
5032
5133
5233
5334
5435
5535
5636
5736
5837
5938
6038
6139
6240
6340
6441
6542
6642
6743
6843
6944
7045
7145
7246
7347

[1,1,2,2,3,4,4,5,6,6,7,7,8,9,9,10,11,11,12,12,13,
 14,14,15,16,16,17,18,18,19,19,20,21,21,22,23,23,
 24,24,25,26,26,27,28,28,29,30,30,31,31,32,33,33,
 34,35,35,36,36,37,38,38,39,40,40,41,42,42,43,43,
 44,45,45,46,47]