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A173908 as a simple table

na(n)
01
1-1
21
30
40
50
61
7-1
82
9-2
103
11-2
123
13-2
144
15-3
166
17-5
189
19-7
2012
21-9
2216
23-12
2422
25-17
2631
27-24
2843
29-33
3059
31-45
3281
33-63
34113
35-88
36156
37-121
38215
39-168
40298
41-233
42412
43-323
44570
45-448
46788
47-621
481090
49-861
501507
51-1193
522084
53-1654
542882
55-2293

[1,-1,1,0,0,0,1,-1,2,-2,3,-2,3,-2,4,-3,6,-5,9,-7,
 12,-9,16,-12,22,-17,31,-24,43,-33,59,-45,81,-63,
 113,-88,156,-121,215,-168,298,-233,412,-323,570,
 -448,788,-621,1090,-861,1507,-1193,2084,-1654,
 2882,-2293]