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A131374 as a simple table

na(n)
01
12
21
31
42
51
62
71
83
91
101
113
123
133
141
152
161
177
183
194
201
211
224
235
248
256
264
271
282
291
3012
315
3215
336
345
351
361
375
387
3916
4015
4116
4210
435
441
452
461
4718
487
4936
5015
5127
5210
536
541

[1,2,1,1,2,1,2,1,3,1,1,3,3,3,1,2,1,7,3,4,1,1,4,5,
 8,6,4,1,2,1,12,5,15,6,5,1,1,5,7,16,15,16,10,5,1,2,
 1,18,7,36,15,27,10,6,1]