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A318724 as a simple table

na(n)
01
12
21
32
45
54
65
78
85
94
105
112
128
1313
1410
155
1610
1713
1818
1925
2020
2117
2216
239
2413
2518
2613
2710
2817
2920
3025
3132
3225
3320
3417
3510
3610
3713
388
399
4016
4117
4220
4325
4418
4513
4610
475
4832
4941
5034
5125
5234
5341
5450
5561
5652
5745
5840
5929
6029
6140
6245
6320
6417
6526
6637
6750
6853
6958

[1,2,1,2,5,4,5,8,5,4,5,2,8,13,10,5,10,13,18,25,20,
 17,16,9,13,18,13,10,17,20,25,32,25,20,17,10,10,13,
 8,9,16,17,20,25,18,13,10,5,32,41,34,25,34,41,50,
 61,52,45,40,29,29,40,45,20,17,26,37,50,53,58]