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A374897 as a simple table

na(n)
010
121
222
333
44
515
66
757
838
99
1010
11111
12-1
13213
1414
1515
16-1
17217
18118
19119
20-1
2121
2222
23123
24-1
2525
2626
27327
28-1
29129
30-1
31731
32-1
3333
3434
3535
36-1
37237
3838
3939
40-1
41141
42142
43143
44-1
45145
4646
47247
48-1
4949
50-1
5151
52-1
53253
54254
5555
56-1
5757
5858
59159
60-1
61161
6262
63763
64-1
6565
66166
67267
68-1
6969

[10,21,22,33,4,15,6,57,38,9,10,111,-1,213,14,15,
 -1,217,118,119,-1,21,22,123,-1,25,26,327,-1,129,
 -1,731,-1,33,34,35,-1,237,38,39,-1,141,142,143,-1,
 145,46,247,-1,49,-1,51,-1,253,254,55,-1,57,58,159,
 -1,161,62,763,-1,65,166,267,-1,69]