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A278492 as a simple table

na(n)
01
12
21
33
43
51
64
75
83
91
105
117
127
133
141
156
169
179
187
193
201
217
2211
2313
2413
257
263
271
288
2913
3015
3115
3213
337
343
351
369
3715
3819
3919
4019
4113
427
433
441
4510
4617
4721
4825
4925
5019
5113
527
533
541
5511
5619
5725
5827
5927
6027
6119
6213
637
643
651
6612
6721
6827
6931
7031
7131
7227
7319
7413
757
763
771
7813
7923
8031
8137
8239
8339
8439
8527
8619
8713
887
893
901

[1,2,1,3,3,1,4,5,3,1,5,7,7,3,1,6,9,9,7,3,1,7,11,
 13,13,7,3,1,8,13,15,15,13,7,3,1,9,15,19,19,19,13,
 7,3,1,10,17,21,25,25,19,13,7,3,1,11,19,25,27,27,
 27,19,13,7,3,1,12,21,27,31,31,31,27,19,13,7,3,1,
 13,23,31,37,39,39,39,27,19,13,7,3,1]