# A029766 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 12
4 48
5 360
6 2160
7 25200
8 201600
9 2540160
10 25401600
11 399168000
12 4790016000
13 80951270400
14 1133317785600
15 23538138624000
16 376610217984000
17 8180810846208000
18 147254595231744000
19 3649353012264960000