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A099363 as a simple table

na(n)
01
1-1
21
3-2
42
5-5
65
7-14
814
9-42
1042
11-132
12132
13-429
14429
15-1430
161430
17-4862
184862
19-16796
2016796
21-58786
2258786
23-208012
24208012
25-742900
26742900
27-2674440
282674440
29-9694845
309694845
31-35357670
3235357670
33-129644790
34129644790
35-477638700
36477638700
37-1767263190
381767263190

[1,-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,-1767263190,
 1767263190]