# A303557 (b-file synthesized from sequence entry)
0 1
1 2
2 12
3 120
4 1680
5 36960
6 960960
7 32672640
8 1241560320
9 57111774720
10 3312482933760
11 205373941893120
12 15197671700090880
13 1246209079407452160
14 107173980829040885760
15 10074354197929843261440
16 1067881544980563385712640
17 126010022307706479514091520
18 15373222721540190500719165440