# A025966 (b-file synthesized from sequence entry)
0 1
1 20
2 260
3 2800
4 27216
5 248640
6 2182720
7 18656000
8 156544256
9 1296655360
10 10641146880
11 86744985600
12 703688298496
13 5688011079680
14 45855653642240
15 368956766617600
16 2964331947687936
17 23790756829593600