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A175921 as a simple table

na(n)
11
22
32
4-1
51
61
72
82
9-1
101
111
122
132
14-1
151
161
172
182
19-1
201
211
222
232
24-1
251
261
272
282
29-1
301
311
322
332
34-1
351
361
372
382
39-1
401
411
422
432
44-1
451
461
472
482
49-1
501
511
522
532
54-1
551
561
572
582
59-1
601
611
622
632
64-1
651
661
672
682
69-1
701
711
722
732
74-1
751

[1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,
 2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,
 1,1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,2,-1,1,1,2,
 2,-1,1,1,2,2,-1,1]