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A002973 as a simple table

na(n)
11
21
32
41
53
62
71
83
94
104
112
125
135
144
152
165
173
181
195
206
217
221
234
242
258
265
277
288
291
306
317
328
339
344
359
365
373
3810
3910
407
416
4210
432
445
4511
4610
475
487
4910
5012
514
5212
539
548
552
5611
573
586
5913
6013
6111
621
6313
6410
656
6611
6713
6814
697
705
719
722
733
748
7510
7612
775
7814
792
803
8114
8211
8315
8416
8516
865
8715
881
898
9011

[1,1,2,1,3,2,1,3,4,4,2,5,5,4,2,5,3,1,5,6,7,1,4,2,
 8,5,7,8,1,6,7,8,9,4,9,5,3,10,10,7,6,10,2,5,11,10,
 5,7,10,12,4,12,9,8,2,11,3,6,13,13,11,1,13,10,6,11,
 13,14,7,5,9,2,3,8,10,12,5,14,2,3,14,11,15,16,16,5,
 15,1,8,11]