# A078665 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 5
5 47
6 105
7 1272
8 8424
9 55856
10 388800
11 6592492
12 37965600
13 1573051680
14 10106845824
15 145938179520
16 2694653982720
17 18948491739696
18 267048208800000
19 23293245955795200
20 466687809894297600
21 3372079713556377600