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A168491 as a simple table

n a(n)
0 1
1 -1
2 2
3 -5
4 14
5 -42
6 132
7 -429
8 1430
9 -4862
10 16796
11 -58786
12 208012
13 -742900
14 2674440
15 -9694845
16 35357670
17 -129644790
18 477638700
19 -1767263190
20 6564120420
21 -24466267020
22 91482563640
23 -343059613650
24 1289904147324
25 -4861946401452
26 18367353072152
27 -69533550916004

[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,
 -69533550916004]

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Last modified February 24 05:48 EST 2018. Contains 299597 sequences. (Running on oeis4.)