# A334767 (b-file synthesized from sequence entry)
1 2
2 6
3 24
4 96
5 384
6 2304
7 9216
8 46080
9 276480
10 1658880
11 6635520
12 53084160
13 212336640
14 1274019840
15 10192158720
16 61152952320
17 244611809280
18 2201506283520
19 8806025134080
20 70448201072640
21 563585608581120
22 3381513651486720
23 13526054605946880