# A208649 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 3
5 6
6 40
7 150
8 2100
9 14700
10 423360
11 5556600
12 325987200
13 8068183200
14 958961203200
15 44996257706400
16 10799101849536000
17 965169727802280000
18 466713183932835840000
19 79775138681769651120000