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A347982 as a simple table

na(n)
1-1
2-1
32
4-1
53
6-1
75
86
94
108
117
12-1
1311
1410
1514
16-1
1713
1812
1917
2018
2115
2221
2319
24-1
259
2622
2726
2820
2923
3024
3129
3228
3327
3433
3534
36-1
3731
3835
3938
4030
4137
4240
4341
4432
4544
4639
4743
48-1
4925
5045
5146
5250
5347
5442
5551
5654
5755
5857
5953
60-1
6159
6258
6352
64-1
6562
6656
6761
6863
6965
7066
7167

[-1,-1,2,-1,3,-1,5,6,4,8,7,-1,11,10,14,-1,13,12,
 17,18,15,21,19,-1,9,22,26,20,23,24,29,28,27,33,34,
 -1,31,35,38,30,37,40,41,32,44,39,43,-1,25,45,46,
 50,47,42,51,54,55,57,53,-1,59,58,52,-1,62,56,61,
 63,65,66,67]