# A089927 (b-file synthesized from sequence entry)
0 1
1 5
2 25
3 120
4 576
5 2760
6 13225
7 63365
8 303601
9 1454640
10 6969600
11 33393360
12 159997201
13 766592645
14 3672966025
15 17598237480
16 84318221376
17 403992869400
18 1935646125625
19 9274237758725
20 44435542668001
21 212903475581280