# A263745 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 2400
8 5424
9 11568
10 26796
11 68966
12 198332
13 558032
14 1509568
15 3898288
16 9694608
17 23885448
18 59953920
19 152383072
20 389677200
21 996510496