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A047972 as a simple table

na(n)
11
21
31
42
52
63
71
83
92
104
115
121
135
146
152
164
175
183
193
207
218
222
232
248
253
261
273
287
299
308
316
3210
337
345
355
367
3712
386
392
404
4110
4212
435
443
451
463
4714
482
492
504
518
5214
5315
545
551
567
5713
5815
5912
608
616
624
6317
6413
6511
667
677
6813
6914
7012
718
722
736
7412
7518
7617
7711
783
791
809
8119
8220
8310
848
852
862
878
8816
8920
9021

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