# A375395 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 7
4 32
5 180
6 1210
7 9520
8 85680
9 867160
10 9749600
11 120582000
12 1626994600
13 23782158400
14 374367193200
15 6314037129400
16 113591474796800
17 2171267969270400
18 43944509528920000
19 938808209417478400
20 21111813400597920000
21 498498097342637392000