# A126930 (b-file synthesized from sequence entry)
0 1
1 -1
2 2
3 -3
4 6
5 -10
6 20
7 -35
8 70
9 -126
10 252
11 -462
12 924
13 -1716
14 3432
15 -6435
16 12870
17 -24310
18 48620
19 -92378
20 184756
21 -352716
22 705432
23 -1352078
24 2704156
25 -5200300
26 10400600
27 -20058300
28 40116600
29 -77558760
30 155117520
31 -300540195
32 601080390
33 -1166803110