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A228731 as a simple table

na(n)
11
21
32
41
53
62
74
81
94
103
115
122
136
144
156
161
175
184
198
203
218
225
239
242
259
266
278
284
2910
306
318
321
3310
345
3512
364
3712
388
3912
403
418
428
4310
445
4512
469
4715
482
4916
509
5110
526
5316
548
5515
564
5716
5810
599
606
6118
628
6316
641
6518
6610
679
685
6918
7012
7120
724
7315
7412
7518
768
7720
7812

[1,1,2,1,3,2,4,1,4,3,5,2,6,4,6,1,5,4,8,3,8,5,9,2,
 9,6,8,4,10,6,8,1,10,5,12,4,12,8,12,3,8,8,10,5,12,
 9,15,2,16,9,10,6,16,8,15,4,16,10,9,6,18,8,16,1,18,
 10,9,5,18,12,20,4,15,12,18,8,20,12]