# A340939 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 42
4 648
5 13620
6 362520
7 11696160
8 443748480
9 19362566160
10 955384416000
11 52602602199840
12 3197371241877120
13 212668103188981440
14 15364762939152506880
15 1198224396270059558400
16 100322035878465399398400
17 8975632678570151712518400
18 854594260998625751469465600