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A031247 as a simple table

na(n)
11
21
31
41
50
61
72
83
93
104
114
125
135
146
155
165
176
186
196
206
216
226
236
246
255
265
276
286
296
306
316
326
336
346
355
365
376
386
396
406
416
426
436
446
455
464
475
486
495
506
516
525
536
546
555
566
576
585
596
605
616
627
638
649
6510
6610
6711
6812
6912
7013
7114
7214
7315
7416
7515
7615
7716
7817
7917
8018
8118
8218

[1,1,1,1,0,1,2,3,3,4,4,5,5,6,5,5,6,6,6,6,6,6,6,6,
 5,5,6,6,6,6,6,6,6,6,5,5,6,6,6,6,6,6,6,6,5,4,5,6,5,
 6,6,5,6,6,5,6,6,5,6,5,6,7,8,9,10,10,11,12,12,13,
 14,14,15,16,15,15,16,17,17,18,18,18]