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A131950 as a simple table

na(n)
01
13
23
35
44
55
67
76
86
97
109
118
1210
138
149
1511
1610
1715
1815
1910
2011
2113
2212
2321
2426
2521
2612
2713
2815
2914
3028
3142
3242
3328
3414
3515
3617
3716
3836
3964
4078
4164
4236
4316
4417
4519
4618
4745
4893
49135
50135
5193
5245
5318
5419

[1,3,3,5,4,5,7,6,6,7,9,8,10,8,9,11,10,15,15,10,11,
 13,12,21,26,21,12,13,15,14,28,42,42,28,14,15,17,
 16,36,64,78,64,36,16,17,19,18,45,93,135,135,93,45,
 18,19]