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A131251 as a simple table

na(n)
01
12
21
33
43
51
64
76
83
91
105
1110
127
133
141
156
1615
1714
187
193
201
217
2221
2325
2415
257
263
271
288
2928
3041
3130
3215
337
343
351
369
3736
3863
3956
4031
4115
427
433
441
4510
4645
4792
4898
4962
5031
5115
527
533
541

[1,2,1,3,3,1,4,6,3,1,5,10,7,3,1,6,15,14,7,3,1,7,
 21,25,15,7,3,1,8,28,41,30,15,7,3,1,9,36,63,56,31,
 15,7,3,1,10,45,92,98,62,31,15,7,3,1]