# A084205 (b-file synthesized from sequence entry)
0 1
1 1
2 -1
3 3
4 -8
5 24
6 -76
7 252
8 -854
9 2950
10 -10343
11 36706
12 -131570
13 475576
14 -1731357
15 6342042
16 -23356185
17 86421603
18 -321111661
19 1197586539
20 -4481348585
21 16819759474
22 -63302097780
23 238835017492
24 -903165412289
25 3422512973645
26 -12994514592311
27 49425252955926