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A071681 as a simple table

na(n)
10
20
31
41
52
62
73
81
93
103
112
124
134
144
154
165
175
183
195
207
215
224
235
246
256
268
276
287
296
306
318
328
3310
346
3510
368
378
386
3910
408
419
427
439
4411
4510
466
4710
4811
4911
508
5112
5210
5310
5414
5513
5614
5713
589
5910
6013
6112
6212
6314
6416
6511
6613
6713
6814
6918
7013
7118
7214
7314
7417
7514
7616
7714
7816
7915
8016
8116
8217
8316
8416

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