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A001031 as a simple table

na(n)
11
22
32
42
52
62
73
82
93
103
113
124
133
142
154
163
174
184
193
203
215
224
234
246
254
263
276
283
294
307
314
325
336
343
355
367
376
385
397
405
415
429
435
444
4510
464
475
487
494
506
519
526
536
549
557
567
5711
586
596
6012
614
625
6310
644
657
6610
676
685
699
708
718
7211
736
745
7513
765
778
7811
796
808
8110
826
836
8414
859
866
8712
887
897
9015
917
928
9313
945
958
9612
978
989

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