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A115141 as a simple table

na(n)
01
1-2
2-1
3-2
4-5
5-14
6-42
7-132
8-429
9-1430
10-4862
11-16796
12-58786
13-208012
14-742900
15-2674440
16-9694845
17-35357670
18-129644790
19-477638700
20-1767263190
21-6564120420
22-24466267020
23-91482563640
24-343059613650
25-1289904147324
26-4861946401452
27-18367353072152

[1,-2,-1,-2,-5,-14,-42,-132,-429,-1430,-4862,
 -16796,-58786,-208012,-742900,-2674440,-9694845,
 -35357670,-129644790,-477638700,-1767263190,
 -6564120420,-24466267020,-91482563640,
 -343059613650,-1289904147324,-4861946401452,
 -18367353072152]