# A294041 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 54
4 768
5 18750
6 233280
7 16470860
8 587202560
9 27119434230
10 630000000000
11 71898540993972
12 686539734515712
13 279856598491241772
14 4767050928164388864
15 500950610595703125000
16 118704798114320964648960
17 10646582170477154154957990
18 478255590155229414229278720