# A145634 (b-file synthesized from sequence entry)
1 2
2 12
3 20
4 280
5 2520
6 27720
7 27720
8 11088
9 62832
10 5969040
11 1989680
12 137287920
13 686439600
14 882565200
15 25594390800
16 1586852229600
17 1586852229600
18 11107965607200
19 410994727466400
20 410994727466400
21 16850783826122400