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A115140 as a simple table

n a(n)
0 1
1 -1
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,-1,-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]

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Last modified February 20 02:07 EST 2018. Contains 299357 sequences. (Running on oeis4.)