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A129996 as a simple table

na(n)
01
1-1
2-2
32
45
5-5
6-14
714
842
9-42
10-132
11132
12429
13-429
14-1430
151430
164862
17-4862
18-16796
1916796
2058786
21-58786
22-208012
23208012
24742900
25-742900
26-2674440
272674440
289694845
29-9694845
30-35357670
3135357670
32129644790
33-129644790
34-477638700
35477638700

[1,-1,-2,2,5,-5,-14,14,42,-42,-132,132,429,-429,
 -1430,1430,4862,-4862,-16796,16796,58786,-58786,
 -208012,208012,742900,-742900,-2674440,2674440,
 9694845,-9694845,-35357670,35357670,129644790,
 -129644790,-477638700,477638700]