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A173108 as a simple table

na(n)
01
11
22
31
45
51
615
72
81
952
105
111
12203
1315
142
151
16877
1752
185
191
204140
21203
2215
232
241
2521147
26877
2752
285
291
30115975
314140
32203
3315
342
351
36678570
3721147
38877
3952
405
411
424213597
43115975
444140
45203
4615
472
481
4927644437
50678570
5121147
52877
5352
545
551

[1,1,2,1,5,1,15,2,1,52,5,1,203,15,2,1,877,52,5,1,
 4140,203,15,2,1,21147,877,52,5,1,115975,4140,203,
 15,2,1,678570,21147,877,52,5,1,4213597,115975,
 4140,203,15,2,1,27644437,678570,21147,877,52,5,1]