# A234294 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 40
4 664
5 15424
6 460576
7 16808320
8 724904896
9 36072438016
10 2034328297984
11 128223244372480
12 8932539799788544
13 681536817951791104
14 56521548341146402816
15 5062454448656689500160
16 487013865350356256137216
17 50082306316236214342844416
18 5482502331779770770018893824