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A120631 as a simple table

na(n)
00
11
23
34
45
58
69
711
812
913
1015
11-1
12-1
13-1
14-1
15-1
1616
1717
1819
1920
2021
2124
2225
2327
2428
2529
2631
27-1
28-1
29-1
30-1
31-1
3232
3333
3435
3536
3637
3740
3841
3943
4044
4145
4247
43-1
44-1
45-1
46-1
47-1
4848
4949
5051
5152
5253
5356
5457
5559
5660
5761
5863
59-1
60-1
61-1
62-1
63-1
6464
6565
6667
6768
6869
6972
7073
7175
7276
7377
7479
75-1
76-1
77-1
78-1
79-1
8080
8181
8283
8384
8485
8588
8689

[0,1,3,4,5,8,9,11,12,13,15,-1,-1,-1,-1,-1,16,17,
 19,20,21,24,25,27,28,29,31,-1,-1,-1,-1,-1,32,33,
 35,36,37,40,41,43,44,45,47,-1,-1,-1,-1,-1,48,49,
 51,52,53,56,57,59,60,61,63,-1,-1,-1,-1,-1,64,65,
 67,68,69,72,73,75,76,77,79,-1,-1,-1,-1,-1,80,81,
 83,84,85,88,89]