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A161904 as a simple table

na(n)
11
21
31
42
51
63
71
84
92
102
111
125
131
146
152
163
171
187
191
208
212
224
231
249
253
263
271
2810
292
305
311
3211
331
3412
352
366
373
384
391
4013
411
4214
432
447
451
4615
473
485
491
5016
512
528
534
544
551
5617
571
5818
592
609
613
626
631
6419
651
6620
672
6810
694
705
711
7221
733
747

[1,1,1,2,1,3,1,4,2,2,1,5,1,6,2,3,1,7,1,8,2,4,1,9,
 3,3,1,10,2,5,1,11,1,12,2,6,3,4,1,13,1,14,2,7,1,15,
 3,5,1,16,2,8,4,4,1,17,1,18,2,9,3,6,1,19,1,20,2,10,
 4,5,1,21,3,7]