# A204444 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 9
5 34
6 140
7 672
8 4752
9 32304
10 230832
11 1780704
12 17927568
13 175473216
14 1780206336
15 18988867584
16 248341303296
17 3173837230080
18 41713375334400
19 568818754560000
20 9150176586240000
21 144343174487040000
22 2329812142295040000