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A131087 as a simple table

na(n)
01
12
21
31
44
51
62
75
86
91
101
118
1211
138
141
152
169
1720
1819
1910
201
211
2212
2329
2440
2529
2612
271
282
2913
3042
3169
3270
3341
3414
351
361
3716
3855
39112
40139
41112
4255
4316
441
452
4617
4772
48167
49252
50251
51168
5271
5318
541
551
5620
5789
58240
59419
60504
61419
62240
6389
6420
651
662
6721
68110
69329
70660
71923
72924

[1,2,1,1,4,1,2,5,6,1,1,8,11,8,1,2,9,20,19,10,1,1,
 12,29,40,29,12,1,2,13,42,69,70,41,14,1,1,16,55,
 112,139,112,55,16,1,2,17,72,167,252,251,168,71,18,
 1,1,20,89,240,419,504,419,240,89,20,1,2,21,110,
 329,660,923,924]