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A247781 as a simple table

na(n)
11
21
32
42
52
62
72
82
93
103
113
123
133
144
154
164
174
184
194
205
215
225
235
245
256
266
276
286
296
306
317
327
337
347
357
368
378
388
398
408
418
429
439
449
459
469
4710
4810
4910
5010
5110
5210
5311
5411
5511
5611
5711
5812
5912
6012
6112
6212
6313
6413
6513
6613
6713
6813
6914
7014
7114
7214
7314
7415
7515
7615

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